Knowles Electronics, LLC

United States of America

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H04R 19/04 - Microphones 88
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H04R 3/00 - Circuits for transducers 34
H04R 1/04 - Structural association of microphone with electric circuitry therefor 25
H04R 25/00 - Deaf-aid sets 25
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1.

MICROPHONE PACKAGE FOR EPOXY OVERFLOW PROTECTION GUARD RING IN CAVITY PCB

      
Application Number CN2019129906
Publication Number 2021/134208
Status In Force
Filing Date 2019-12-30
Publication Date 2021-07-08
Owner
  • KNOWLES ELECTRONICS, LLC (USA)
  • ZHANG, Shane (China)
  • YU, Fisher (China)
  • SHEN, Jonas (China)
Inventor
  • Zhang, Shane
  • Watson, Joshua
  • Yu, Fisher
  • Shen, Jonas

Abstract

A microphone assembly including an acoustic transducer that generates an electrical signal responsive to acoustic activity, and an integrated circuit electrically coupled to the acoustic transducer and that receives the electrical signal from the acoustic transducer and generate an output signal representative of the acoustic activity. The microphone assembly also includes a substrate comprising a first surface on which the integrated circuit is mounted, a guard ring mounted on the substrate and elevated relative to the first surface of the substrate, and a can mounted to the guard ring, wherein the can, the guard ring, and the substrate form a housing in which the transducer and integrated circuit are disposed.

IPC Classes  ?

  • B81C 1/00 - Manufacture or treatment of devices or systems in or on a substrate
  • H04R 19/00 - Electrostatic transducers

2.

MICROPHONE ASSEMBLY WITH FREE FALL DETECTION

      
Application Number US2020026532
Publication Number 2020/210120
Status In Force
Filing Date 2020-04-03
Publication Date 2020-10-15
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor Albers, John

Abstract

A microphone assembly includes an acoustic transducer configured to generate an analog signal in response to pressure changes sensed by the acoustic transducer. The analog signal includes frequency components below a threshold frequency. The microphone assembly also includes an integrated circuit electrically coupled to the acoustic transducer and configured to determine a characteristic of frequency components below the threshold frequency, determine whether the characteristic of the frequency components corresponds to a fall event, and generate an output signal in response to a determination that the characteristic of the frequency components corresponds to the fall event. The microphone assembly also includes a housing having an external device interface with electrical contacts. The acoustic transducer and the integrated circuit are disposed within the housing. The integrated circuit is electrically coupled to contacts of the external device interface.

IPC Classes  ?

  • H04R 25/00 - Deaf-aid sets
  • A61B 5/11 - Measuring movement of the entire body or parts thereof, e.g. head or hand tremor or mobility of a limb

3.

NON-PLANAR INGRESS PROTECTION ELEMENT FOR A SENSOR DEVICE

      
Application Number US2020026734
Publication Number 2020/210134
Status In Force
Filing Date 2020-04-03
Publication Date 2020-10-15
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor Albers, John

Abstract

A sensor device includes a substrate, a microelectromechanical systems (MEMS) transducer disposed on the substrate, in integrated circuit, and a cover disposed on the substrate. The sensor device includes a port or an opening for allowing acoustic energy to be incident on the MEMS transducer. The sensor device further includes an ingress protection element positioned to cover the port, the ingress protection element comprising at least one non-planar portion.

IPC Classes  ?

4.

MICROPHONE DEVICE WITH COMMUNICATION INTERFACE

      
Application Number US2020027844
Publication Number 2020/210758
Status In Force
Filing Date 2020-04-10
Publication Date 2020-10-15
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Thukral, Saket
  • Schaller, Lane

Abstract

Methods, systems, and apparatuses, for a microphone. In particular, the microphone includes a housing having an external device interface (205) with a plurality of contacts (210A, 210B, 210C, 210D, and 210E) including a data contact. An electro-acoustic transducer (302) is configured to generate an electrical signal in response to sound. An electrical circuit (304) is coupled to contacts of the interface, the electrical circuit including an ADC (316) having an input coupled to an output of a conditioning circuit and configured to convert the electrical signal to audio data after conditioning. A controller (314) is configured to communicate data, other than the audio data, via the data contact of the external device interface during a start-up transition period of the microphone assembly, wherein the controller is configured to communicate the audio data via the data contact of the external device interface only after the start-up transition period is complete.

IPC Classes  ?

  • H04R 1/04 - Structural association of microphone with electric circuitry therefor

5.

RF IMMUNE MICROPHONE

      
Application Number CN2019082010
Publication Number 2020/206628
Status In Force
Filing Date 2019-04-10
Publication Date 2020-10-15
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor Yochem, Donald

Abstract

The present disclosure relates to microphone devices. One microphone assembly includes a transducer and a housing. The microphone assembly includes an integrated circuit coupled to the transducer. The housing includes a port, a base, and a cover. The cover includes an inner wall and an outer wall. The inner wall and outer wall can be coupled to the base. The inner wall and the base are mechanically coupled and define an enclosed volume. The transducer is disposed in the enclosed volume.

IPC Classes  ?

6.

ENCLOSURES FOR MICRPHONE ASSEMBLIES INCLUDING A FLUOROPOLYMER INSULATING LAYER

      
Application Number US2020025941
Publication Number 2020/205852
Status In Force
Filing Date 2020-03-31
Publication Date 2020-10-08
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Ariffin, Adam
  • Albers, John

Abstract

A microphone assembly comprises a substrate. An acoustic transducer is disposed on the substrate, the acoustic transducer configured to generate an electrical signal responsive to acoustic activity. An integrated circuit is disposed on the substrate and electrically coupled to the acoustic transducer, the integrated circuit configured to generate an output signal indicative of the acoustic activity based on the electrical signal from the acoustic transducer. An enclosure is coupled to the substrate and defines an internal volume between the enclosure and the substrate, the enclosure having an outer surface exposed to an outside environment of the microphone assembly, and an inner surface adjacent the internal volume. An insulating layer is disposed on the inner surface of the enclosure. The insulating layer comprises a fluoropolymer.

IPC Classes  ?

7.

INSERT MOLDED OR OVER MOLDED INSULATING LAYERS ON ENCLOSURES FOR MICROPHONE ASSEMBLIES

      
Application Number US2019068503
Publication Number 2020/159652
Status In Force
Filing Date 2019-12-24
Publication Date 2020-08-06
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Talag, Norman Dennis
  • Borna, Lili
  • Lim, Tony

Abstract

A microphone assembly comprises a substrate. An acoustic transducer is disposed on the substrate and configured to generate an electrical signal responsive to an acoustic signal. An integrated circuit is disposed on the substrate and electrically coupled to the acoustic transducer. An enclosure is disposed on the substrate, and comprises a main body, and a sidewall projecting axially from outer edges of the main body towards the substrate and contacting the substrate such that an internal volume is defined between the enclosure and the substrate. An insulating layer is insert molded on an inner surface of the enclosure, or over molded on an outer surface of the enclosure such that the insulating layer is not disposed on a portion of the sidewall proximate to the substrate.

IPC Classes  ?

  • H04R 19/04 - Microphones
  • H04R 31/00 - Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor

8.

INTRINSICALLY SAFE MICROPHONE ASSEMBLY

      
Application Number US2019068504
Publication Number 2020/159653
Status In Force
Filing Date 2019-12-24
Publication Date 2020-08-06
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • King, Charles
  • Barry, Daryl

Abstract

A microphone assembly includes a housing having a host device interface, a MEMS transducer disposed in the housing and configured to generate electrical signals in response to acoustic activity, an integrated circuit disposed in the housing and configured to process the electrical signals from the MEMS transducer and generate an output representative of the acoustic activity, a host communication path between the integrated circuit and contacts of the host device interface, and a secure communication path between the integrated circuit and an output interface. The secure communication path is isolated from the host communication path. The integrated circuit is configured to indicate a state of the microphone assembly at the output interface via the secure communication path in response to a command received at the microphone assembly.

IPC Classes  ?

  • H04R 1/04 - Structural association of microphone with electric circuitry therefor
  • G06F 21/83 - Protecting input, output or interconnection devices input devices, e.g. keyboards, mice or controllers thereof
  • H04M 1/68 - Circuit arrangements for preventing eavesdropping
  • H04R 3/00 - Circuits for transducers

9.

MICROPHONE ASSEMBLY WITH BACK VOLUME VENT

      
Application Number US2020016012
Publication Number 2020/160348
Status In Force
Filing Date 2020-01-31
Publication Date 2020-08-06
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Pedersen, Michael
  • Loeppert, Peter V.

Abstract

The problem of contaminants entering a microphone assembly through a pressure equalization aperture is mitigated by moving the pressure equalization aperture from a location near the acoustic port to a location on the cover of the microphone assembly. This is achieved by fabricating an aperture reduction structure using a separate dedicated die, with an aperture of diameter ~25 microns or less disposed on the aperture reduction structure, and then coupling the aperture reduction structure to the cover of the microphone. The relatively smaller aperture on the cover after the coupling of the aperture reduction structure is used for pressure equalization of the back volume of the microphone with a pressure outside of the microphone assembly.

IPC Classes  ?

10.

LEAKAGE CURRENT DETECTION FROM BIAS VOLTAGE SUPPLY OF MEMS MICROPHONE ASSEMBLY

      
Application Number US2019068781
Publication Number 2020/154066
Status In Force
Filing Date 2019-12-27
Publication Date 2020-07-30
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Jørgensen, Tore Sejr
  • Nielsen, Allan

Abstract

The present disclosure relates in a first aspect to a method of detecting leakage current from a DC bias voltage circuit of an integrated circuit for a capacitive microelectro mechanicalsystems (MEMS) transducer. A test signal with a predetermined frequency and level is superimposed on a first DC bias voltage generated by the DC bias voltage circuit.

IPC Classes  ?

11.

ACOUSTIC VALVE FOR HEARING DEVICE

      
Application Number US2019063321
Publication Number 2020/142148
Status In Force
Filing Date 2019-11-26
Publication Date 2020-07-09
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor Monti, Christopher

Abstract

Acoustic valves including a housing having an acoustic passage are disclosed. A bobbin located in the housing includes a valve seat and a body member housing a magnetic core. An electrical coil is disposed about a portion of the body member, an axial dimension of the electrical coil substantially aligned with an axial dimension of the magnetic core. The electrical coil generates a magnetic field when energized. An armature is movably disposed in the housing between the valve seat and a second surface of the acoustic valve. The valve has a first stable state when the armature is positioned against the valve seat, and the valve has a second stable state when the armature is positioned against the second surface. The valve seat and the second surface are on opposite sides of the armature. The armature is movable between the valve seat and the second surface when the electrical coil is energized, such that the acoustic passage is more obstructed when the armature is positioned against the valve seat than when the armature is positioned against the second surface.

IPC Classes  ?

  • H04R 25/00 - Deaf-aid sets
  • H04R 1/10 - Earpieces; Attachments therefor
  • F16K 31/08 - Operating means; Releasing devices magnetic using a magnet using a permanent magnet

12.

RECEIVER HOUSING WITH INTEGRATED SENSORS FOR HEARING DEVICE

      
Application Number US2019064258
Publication Number 2020/142154
Status In Force
Filing Date 2019-12-03
Publication Date 2020-07-09
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Houcek, Earl E.
  • Manley, Matthew
  • Barry, Daryl
  • Zhang, Yahui
  • Kearey, Steve

Abstract

A hearing device and subassembly therefor includes a sleeve member configured for at least partial insertion into a user's ear canal, the sleeve member defining a cavity that receives and retains at least a portion of a sound-producing electroacoustic transducer. The sleeve member includes a cable interface, wherein an electrical interface of a sound-producing electroacoustic transducer received in the cavity is accessible via the cable interface. The device also includes on or more sensors integrated with the sleeve member and positioned to sense a biomarker or other condition when the sleeve member is at least partially inserted into the user's ear canal. The hearing device includes conductive traces integrated with the sleeve member, where at least one conductive trace is electrically connected to the sensor and electrically connectable via the cable interface.

IPC Classes  ?

13.

ACOUSTIC RECEIVER-IN-CANAL EAR TIP

      
Application Number US2019065880
Publication Number 2020/142174
Status In Force
Filing Date 2019-12-12
Publication Date 2020-07-09
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor Manley, Matthew

Abstract

An ear tip for a hearing device includes a body member having a receiver retention portion that is communicably coupled to a sound port. The receiver retention portion is configured to receive and capture a receiver such as a balanced armature receiver. An electrical interface of the receiver is accessible via an opening in the receiver retention portion. The ear tip also includes an ear interface portion that is disposed at least partially about the body member. The ear interface portion is configured to be disposed in a user's ear canal. The ear interface portion and the body member are integrally formed as a unitary member.

IPC Classes  ?

14.

MEMS STRUCTURE WITH STIFFENING MEMBER

      
Application Number US2019068415
Publication Number 2020/139860
Status In Force
Filing Date 2019-12-23
Publication Date 2020-07-02
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor Loeppert, Peter V.

Abstract

A microelectromechanical system (MEMS) transducer includes a transducer substrate, a diaphragm, and a stiffening member. A first side of the diaphragm is coupled to the transducer substrate. A second side of the diaphragm is coupled to the stiffening member. The stiffening member includes a plurality of fingers extending inwards from a perimeter of an aperture defined by the transducer substrate.

IPC Classes  ?

15.

AUDIO LEVEL ESTIMATOR ASSISTED FALSE WAKE ABATEMENT SYSTEMS AND METHODS

      
Application Number US2019066504
Publication Number 2020/131681
Status In Force
Filing Date 2019-12-16
Publication Date 2020-06-25
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Patel, Ketul
  • Ng, Casey
  • Chang, Edward

Abstract

A system and method provides for false wake abatement. For instance, an audio energy detection controller opens a keyword detection window in response to a detected audio input level reaching a threshold and a keyword detector detects a keyword in response to a detected audio input corresponding to a keyword signature. In response to both a keyword being detected and the detected audio input level indicating a near field source of the speech, a device may be triggered to awaken. In this manner, the incidence of false awakenings due to keywords spoken by proximate third parties is ameliorated.

IPC Classes  ?

  • G10L 25/78 - Detection of presence or absence of voice signals
  • G10L 15/08 - Speech classification or search

16.

MULTI-RATE INTEGRATED CIRCUIT CONNECTABLE TO A SENSOR

      
Application Number US2019065538
Publication Number 2020/123550
Status In Force
Filing Date 2019-12-10
Publication Date 2020-06-18
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Nielsen, Allan Nogueras
  • Jakobsen, Emil
  • Høvesten, Per Flemming

Abstract

An integrated circuit connectable to a sensor includes a transconductance element and a current-input analog-to-digital converter (I- ADC). The transconductance element is connectable to the sensor and is configured to generate a current signal representative of an output of the sensor. The I-ADC is configured to sample and quantize the current signal to generate a corresponding digital sensor signal. The I-ADC includes a continuous-time (CT) integrator stage, a discrete-time (DT) integrator stage, and a feedback digital-to-analog converter (FB-DAC). The CT integrator stage is configured to receive the current output and the I-ADC is configured to generate the digital sensor signal based on an output of the CT integrator stage and an output of the DT integrator stage. The FB-DAC is configured to provide a feedback signal based on the digital sensor signal for adding to the current signal.

IPC Classes  ?

  • H04R 3/06 - Circuits for transducers for correcting frequency response of electrostatic transducers
  • H03M 1/06 - Continuously compensating for, or preventing, undesired influence of physical parameters
  • H03M 1/10 - Calibration or testing
  • H04R 19/04 - Microphones

17.

MICROPHONE ASSEMBLIES INCLUDING INTEGRATED VIBRATION TRANSDUCER AND WEARABLE DEVICES INCLUDING THE SAME

      
Application Number US2019065821
Publication Number 2020/123725
Status In Force
Filing Date 2019-12-11
Publication Date 2020-06-18
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Pedersen, Michael
  • Albers, John
  • Barry, Daryl
  • Chandrasekaran, Venkataraman
  • Qutub, Sarmad
  • Watson, Joshua

Abstract

A transducer assembly comprises an acoustic transducer comprising a transducer substrate having a first aperture defined at a first location of the transducer substrate, an acoustic transducer diaphragm disposed on the transducer substrate over the first aperture, and an acoustic transducer back plate disposed on the transducer substrate axially spaced apart from the acoustic transducer diaphragm over the first aperture. The transducer assembly also includes a vibration transducer comprising the transducer substrate having a second aperture defined at a second location thereof, a vibration transducer diaphragm disposed on the transducer substrate over the second aperture, a vibration transducer back plate disposed on the transducer substrate axially spaced apart from the vibration transducer back plate over the second aperture, and an anchor coupled to one of the vibration transducer diaphragm or the vibration transducer back plate, the anchor disposed in the second aperture and suspended freely therewithin.

IPC Classes  ?

18.

COMPOSITE DIAPHRAGMS HAVING BALANCED STRESS

      
Application Number US2019062964
Publication Number 2020/112615
Status In Force
Filing Date 2019-11-25
Publication Date 2020-06-04
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Loeppert, Peter
  • Lee, Sung Bok

Abstract

An acoustic transducer comprises a transducer substrate defining an aperture therein. A diaphragm is disposed on the transducer substrate. The diaphragm comprises a diaphragm inner portion disposed over the aperture such that an outer edge of the diaphragm inner portion is located radially inwards of a rim of the aperture, the diaphragm inner portion having a first stress. A diaphragm outer portion extends radially from the outer edge of the diaphragm inner portion to at least the rim of the aperture, the diaphragm outer portion having a second stress different from the first stress.

IPC Classes  ?

  • H04R 7/04 - Plane diaphragms
  • H04R 7/16 - Mounting or tensioning of diaphragms or cones
  • H04R 31/00 - Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor
  • H04R 1/08 - Mouthpieces; Attachments therefor
  • B06B 1/02 - Processes or apparatus for generating mechanical vibrations of infrasonic, sonic or ultrasonic frequency making use of electrical energy

19.

INTRINSIC-STRESS SELF-COMPENSATED MICROELECTROMECHANICAL SYSTEMS TRANSDUCER

      
Application Number US2019063247
Publication Number 2020/112769
Status In Force
Filing Date 2019-11-26
Publication Date 2020-06-04
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Nawaz, Mohsin
  • Shubham, Shubham

Abstract

A diaphragm for use in a transducer, the diaphragm including a flexible layer configured to deflect in response to changes in a differential pressure. The flexible layer includes a lattice grid. The lattice grid includes a first plurality of substantially elongate openings oriented along an axis and a second plurality of substantially elongate openings extending generally parallel to the axis. The second plurality of openings is substantially offset from the first plurality of openings in a direction substantially parallel to the axis. The first plurality of openings and the second plurality of openings define a first plurality of spaced apart grid beams extending between and substantially parallel to the axis and a second plurality of spaced apart grid beams extending substantially perpendicular to the axis. The second plurality of grid beams is configured to connect adjacent ones of the first plurality of grid beams.

IPC Classes  ?

  • H04R 19/00 - Electrostatic transducers
  • H04R 19/04 - Microphones
  • H04R 7/08 - Plane diaphragms comprising a plurality of sections or layers comprising superposed layers separated by air or other fluid

20.

FORCE FEEDBACK COMPENSATED ABSOLUTE PRESSURE SENSOR

      
Application Number US2019062046
Publication Number 2020/106637
Status In Force
Filing Date 2019-11-18
Publication Date 2020-05-28
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Loeppert, Peter V.
  • Pedersen, Michael

Abstract

A MEMS transducer for a microphone includes a closed chamber, an array of conductive pins, a dielectric grid, and a diaphragm. The closed chamber is at a pressure lower than atmospheric pressure. The array of conductive pins is in a fixed position in the closed chamber, distributed in two dimensions, and have gaps formed therebetween. The dielectric grid is positioned within the closed chamber, includes a grid of dielectric material positioned between the gaps of the array of conductive pins, and is configured to move parallel to the conductive pins. The diaphragm is configured to form a portion of the closed chamber and deflect in response to changes in a differential pressure between the pressure within the closed chamber and a pressure outside the transducer. The diaphragm is configured to move the dielectric grid relative to the array of conductive pins in response to a change in the differential pressure.

IPC Classes  ?

  • H04R 19/04 - Microphones
  • H04R 1/32 - Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only

21.

ACOUSTIC TRANSDUCER WITH REDUCED DAMPING

      
Application Number US2019060561
Publication Number 2020/097524
Status In Force
Filing Date 2019-11-08
Publication Date 2020-05-14
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Naderyan, Vahid
  • Lee, Sung Bok
  • Kuntzman, Michael

Abstract

An acoustic transducer for generating electrical signals in response to acoustic signals includes a transducer substrate, a back plate, and a diaphragm assembly. The diaphragm assembly includes a first diaphragm and a second diaphragm coupled thereto. The second diaphragm is positioned closer to the back plate than the first diaphragm. The second diaphragm includes a plurality of diaphragm apertures configured to allow air to pass through the second diaphragm. Each of the back plate and the first diaphragm are coupled to the transducer substrate at their periphery. In an embodiment, the transducer includes a post coupled to the first diaphragm and the second diaphragm, the post configured to prevent movement of the second diaphragm relative to the first diaphragm in a direction substantially perpendicular to the second diaphragm.

IPC Classes  ?

  • H04R 7/26 - Damping by means acting directly on free portion of diaphragm or cone
  • H04R 19/00 - Electrostatic transducers

22.

DIAGNOSTICS FOR ACOUSTIC DEVICES AND METHODS

      
Application Number US2019057176
Publication Number 2020/086444
Status In Force
Filing Date 2019-10-21
Publication Date 2020-04-30
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor King, Charles

Abstract

An acoustic device and method generates an acoustic signal by applying an excitation signal to a first coil disposed about an armature of an acoustic receiver. A second coil magnetically coupled to the first coil generates an electrical output signal in response to the excitation signal applied to the first coil, wherein the output signal of the second coil is indicative of a change in a state or operation of the receiver or acoustic device. In some embodiments, the first and second coils are wired independently of each other, and the acoustic device further includes an electrical circuit which determines the change in the acoustic performance based on a change in the electrical output signal of the second coil.

IPC Classes  ?

23.

MICROPHONE ASSEMBLY WITH STANDOFFS FOR DIE BONDING

      
Application Number US2019057820
Publication Number 2020/086819
Status In Force
Filing Date 2019-10-24
Publication Date 2020-04-30
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Lim, Tony K.
  • Talag, Norman Dennis

Abstract

A microphone assembly includes a substrate and a microelectromechanical systems (MEMS) die. The substrate comprises a top layer and a bottom layer. The top layer comprises a layer of solder mask material spanning across at least a portion of the substrate and one or more standoffs formed of the solder mask material. The one or more standoffs and the layer of solder mask material comprising a single, contiguous structure. The MEMS die is disposed on the one or more standoffs and is coupled to the substrate via a bonding material. The bonding material forms an acoustic seal between the substrate and the MEMS die.

IPC Classes  ?

  • H04R 19/00 - Electrostatic transducers
  • H04R 19/04 - Microphones
  • H04R 1/40 - Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers

24.

DIGITAL TRANSDUCER INTERFACE SCRAMBLING

      
Application Number US2019055221
Publication Number 2020/076846
Status In Force
Filing Date 2019-10-08
Publication Date 2020-04-16
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Pawlowski, Andrzej
  • Thomsen, Henrik
  • Larsen, Rene Rye

Abstract

The present disclosure relates to an integrated circuit connectable to a microelectromechanical system (MEMS) transducer. The MEMS transducer is configured to generate a transducer audio signal in response to sound. The integrated circuit comprises a digital scrambling circuit coupled to a data communication interface. The digital scrambling circuit is configured to convert a digital audio stream, representative of the transducer audio signal, into a corresponding scrambled data stream. The integrated circuit additionally comprises a data bus interface coupled to the digital scrambling circuit and configured to output the scrambled data stream.

IPC Classes  ?

  • H04R 3/06 - Circuits for transducers for correcting frequency response of electrostatic transducers
  • H04R 3/00 - Circuits for transducers
  • H04R 1/22 - Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
  • H04R 1/40 - Arrangements for obtaining desired frequency or directional characteristics for obtaining desired directional characteristic only by combining a number of identical transducers

25.

MICROPHONE DEVICE WITH INGRESS PROTECTION

      
Application Number US2019054726
Publication Number 2020/072920
Status In Force
Filing Date 2019-10-04
Publication Date 2020-04-09
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Lee, Sung Bok
  • Naderyan, Vahid
  • Yu, Bing
  • Kuntzman, Michael
  • Ma, Yunfei
  • Conklin, Wade
  • Loeppert, Peter

Abstract

A microphone device includes a base and a microelectromechanical system (MEMS) transducer and an integrated circuit (IC) disposed on the base. The microphone device also includes a cover mounted on the base and covering the MEMS transducer and the IC. The MEMS transducer includes a diaphragm attached to a surface of the substrate and a back plate mounted on the substrate and in a spaced apart relationship with the diaphragm. The diaphragm is attached to the surface of the substrate along at least a portion of a periphery of the diaphragm. The diaphragm can include a silicon nitride insulating layer, and a conductive layer, that faces a conductive layer of the back plate. The MEMS transducer can include a peripheral support structure that is disposed between at least a portion of the diaphragm and the substrate. The diaphragm can include one or more pressure equalizing apertures.

IPC Classes  ?

26.

ACOUSTIC TRANSDUCERS WITH A LOW PRESSURE ZONE AND DIAPHRAGMS HAVING ENHANCED COMPLIANCE

      
Application Number US2019054695
Publication Number 2020/072904
Status In Force
Filing Date 2019-10-04
Publication Date 2020-04-09
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Kuntzman, Michael
  • Pedersen, Michael
  • Lee, Sung Bok
  • Yu, Bing
  • Naderyan, Vahid
  • Loeppert, Peter

Abstract

An acoustic transducer for generating electrical signals in response to acoustic signals, comprises a first diaphragm having a first corrugation formed therein. A second diaphragm has a second corrugation formed therein, and is spaced apart from the first diaphragm such that a cavity having a pressure lower than atmospheric pressure is formed therebetween. A back plate is disposed between the first diaphragm and the second diaphragm. One or more posts extend from at least one of the first diaphragm or the second diaphragm towards the other through the back plate. The one or more posts prevent each of the first diaphragm and the second diaphragm from contacting the back plate due to movement of the first diaphragm and/or the second diaphragm towards the back plate. Each of the first corrugation and the second corrugation protrude outwardly from the first diaphragm and the second diaphragm, respectively, away from the back plate.

IPC Classes  ?

27.

METHODS OF FORMING MEMS DIAPHRAGMS INCLUDING CORRUGATIONS

      
Application Number US2019054752
Publication Number 2020/072938
Status In Force
Filing Date 2019-10-04
Publication Date 2020-04-09
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Lee, Sung, Bok
  • Naderyan, Vahid
  • Yu, Bing
  • Kuntzman, Michael
  • Ma, Yunfei
  • Pedersen, Michael

Abstract

A method of forming an acoustic transducer comprises providing a substrate and depositing a first structural layer on the substrate. The first structural layer is selectively etched to form at least one of an enclosed trench or an enclosed pillar thereon. A second structural layer is deposited on the first structural layer and includes a depression or a bump corresponding to the enclosed trench or pillar, respectively. At least the second structural layer is heated to a temperature above a glass transition temperature of the second structural layer causing the second structural layer to reflow. A diaphragm layer is deposited on the second structural layer such that the diaphragm layer includes at least one of a downward facing corrugation corresponding to the depression or an upward facing corrugation corresponding to the bump. The diaphragm layer is released, thereby forming a diaphragm suspended over the substrate.

IPC Classes  ?

  • B81C 1/00 - Manufacture or treatment of devices or systems in or on a substrate
  • B81B 3/00 - Devices comprising flexible or deformable elements, e.g. comprising elastic tongues or membranes

28.

SYNTHETIC NONLINEAR ACOUSTIC ECHO CANCELLATION SYSTEMS AND METHODS

      
Application Number US2019053446
Publication Number 2020/069310
Status In Force
Filing Date 2019-09-27
Publication Date 2020-04-02
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor Unruh, Andrew

Abstract

A communication system and method is disclosed. The system and method provides for acoustic echo cancellation. For instance, a processor implements a non-linear loudspeaker model to approximate loudspeaker performance. Using the model, a cancellation signal may be generated to ameliorate cross-talk between a loudspeaker and microphone to diminish an echo.

IPC Classes  ?

  • H04M 9/08 - Two-way loud-speaking telephone systems with means for conditioning the signal, e.g.  for suppressing echoes for one or both directions of traffic

29.

DIGITAL MICROPHONE WITH REDUCED PROCESSING NOISE

      
Application Number US2019050484
Publication Number 2020/055923
Status In Force
Filing Date 2019-09-10
Publication Date 2020-03-19
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Abed, Adam
  • Cordon, Edwin
  • Warren, Niel
  • Sanders, Donald
  • Patel, Maulik
  • Liya, Dushyant

Abstract

A microphone assembly includes a housing including a base, a cover, and a sound port. The microphone assembly further includes an acoustic transducer and an electrical circuit, both of which are disposed in an enclosed volume of the housing. The transducer and electrical circuit work in concert to convert sound waves into a processed digital audio signal. The electrical circuit is configured to process digital data in a series of frames that correspond to a fixed period in time. The electrical circuit is further configured to reduce noise in the resulting signal by varying the current draw required in a randomized or pseudo-randomized fashion between adjacent frames of digital data.

IPC Classes  ?

  • H04R 3/04 - Circuits for transducers for correcting frequency response
  • H04R 3/02 - Circuits for transducers for preventing acoustic reaction

30.

MICROPHONE DEVICE WITH INDUCTIVE FILTERING

      
Application Number US2019042675
Publication Number 2020/023317
Status In Force
Filing Date 2019-07-19
Publication Date 2020-01-30
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Watson, Joshua
  • Jumani, Karan
  • Yochem, Donald

Abstract

Microphone devices and methods for manufacturing microphone devices that include a substrate having a first surface and a second surface, a cover secured to the first surface of the substrate to form an enclosed back volume, an application specific integrated circuit (ASIC) embedded between the first surface and the second surface of the substrate, a microelectromechanical systems (MEMS) transducer mounted on the first surface of the substrate, and an inductor mounted on the first surface of the substrate.

IPC Classes  ?

  • H04R 19/00 - Electrostatic transducers
  • H04R 3/00 - Circuits for transducers
  • H04R 31/00 - Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor

31.

TRANSCONDUCTANCE AMPLIFIER

      
Application Number US2019037803
Publication Number 2019/246151
Status In Force
Filing Date 2019-06-18
Publication Date 2019-12-26
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Tingleff, Jens
  • Fürst, Claus, Erdmann

Abstract

The present disclosure relates to an integrated circuit comprising a transconductance amplifier which is connectable to a microelectromechanical systems (MEMS) transducer. The transconductance amplifier comprises a first input coupled to a first current conveyor and a second input coupled to a second current conveyor for converting a single-ended or differential transducer signal voltage into an intermediate signal current representative of the transducer signal voltage through a shared reference resistor. The transconductance amplifier further comprises first and second output circuits coupled to the shared reference resistor and being configured to convert the intermediate current signal into a corresponding differential output current signal through first and second output terminals for driving a load.

IPC Classes  ?

32.

MICROPHONE ASSEMBLY WITH REDUCED NOISE

      
Application Number US2019037805
Publication Number 2019/246152
Status In Force
Filing Date 2019-06-18
Publication Date 2019-12-26
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Hansen, Kristian, Adelbert
  • Thomsen, Henrik
  • Shajaan, Mohammad
  • Tingleff, Jens
  • Fürst, Claus, Erdmann

Abstract

A microphone assembly comprising: a housing including a base, a cover, and a sound port; a MEMS transducer element disposed in the housing, the transducer element configured to convert sound into a microphone signal voltage at a transducer output; and a processing circuit. The processing circuit comprising a transconductance amplifier comprising an input node connected to the transducer output for receipt of the microphone signal voltage, the transconductance amplifier being configured to generate an amplified current signal representative of the microphone signal voltage in accordance with a predetermined transconductance of the transconductance amplifier; and an analog-to-digital converter comprising an input node connected to receive the amplified current signal, said analog-to-digital converter being configured to sample and quantize the amplified current signal to generate a corresponding digital microphone signal.

IPC Classes  ?

33.

ACOUSTIC AWARE VOICE USER INTERFACE

      
Application Number US2019038060
Publication Number 2019/246314
Status In Force
Filing Date 2019-06-19
Publication Date 2019-12-26
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Nemala, Sridhar
  • Bharadwaj, Dhruv
  • Singh, Navot
  • Gadonniex, Sharon

Abstract

A method for optimal configuration of a voice user interface is disclosed herein. The method includes receiving an audio signal; processing the audio signal by a context awareness module to generate context information regarding an acoustic environment of the audio signal; determining, based on the context information, an optimal one of a plurality of different configurations of a voice user interface to perform voice user interface processing of the audio signal; and performing the voice user interface processing of the audio signal using the optimal configuration of the plurality of different configurations.

IPC Classes  ?

  • G10L 15/28 - Constructional details of speech recognition systems
  • G10L 15/22 - Procedures used during a speech recognition process, e.g. man-machine dialog

34.

INTEGRATED MICROPHONE AND ANTENNA APPARATUS AND METHOD OF OPERATION

      
Application Number US2019035261
Publication Number 2019/236501
Status In Force
Filing Date 2019-06-03
Publication Date 2019-12-12
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Jumani, Karen
  • Yochem, Donald

Abstract

An integrated microphone and antenna. The microphone includes a housing and an acoustic transducer. The housing defines a cavity and includes a conductive layer. The acoustic transducer is positioned within the cavity and structured to generate an acoustic signal. The antenna is at least partially integrated with the microphone and structured to transmit and receive radio frequency signals. The antenna is structured to utilize the conductive layer of the housing as a radiating element.

IPC Classes  ?

  • H04R 1/04 - Structural association of microphone with electric circuitry therefor

35.

SYSTEMS AND METHODS FOR REDUCING NOISE IN MICROPHONES

      
Application Number US2019032034
Publication Number 2019/222106
Status In Force
Filing Date 2019-05-13
Publication Date 2019-11-21
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Loeppert, Peter
  • Pedersen, Michael
  • Kuntzman, Michael

Abstract

A microphone assembly comprises a substrate and an enclosure disposed on the substrate. A port is defined in one of the substrate or the enclosure. An acoustic transducer is configured to generate an electrical signal in response to acoustic activity. The acoustic transducer comprises a membrane separating a front volume from a back volume of the microphone assembly. The front volume is in fluidic communication with the port, and the back volume is filled with a first gas having a thermal conductivity lower than a thermal conductivity of air. An integrated circuit is electrically coupled to the acoustic transducer and configured to receive the electrical signal from the acoustic transducer. At least a portion of a boundary defining at least one of the front volume or the back volume is configured to have compliance so as to allow pressure equalization. The first gas is different from the second gas.

IPC Classes  ?

  • H04R 1/04 - Structural association of microphone with electric circuitry therefor
  • H04R 19/04 - Microphones

36.

ACOUSTIC ASSEMBLY HAVING AN ACOUSTICALLY PERMEABLE MEMBRANE

      
Application Number US2019028957
Publication Number 2019/209976
Status In Force
Filing Date 2019-04-24
Publication Date 2019-10-31
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Szczech, John
  • Vos, Sandra
  • Ryan, William
  • Du, Yu
  • Salazar, Jose
  • King, Charles

Abstract

An acoustic device including a motor disposed in a housing having a non- porous elastomeric membrane disposed across an acoustic path defined by a sound port of the housing is disclosed. The motor may be embodied as MEMS transducer configured to generate an electrical signal responsive to an acoustic signal, or as some other electromechanical device. The membrane has a compliance that is 1 to 100 times a compliance of the acoustic device without the membrane, wherein the membrane prevents ingress of contaminants (e.g., solids, liquids or light) via the sound port while permitting propagation of the acoustic signal along the acoustic path without significant loss.

IPC Classes  ?

  • H04R 19/04 - Microphones
  • H04R 1/04 - Structural association of microphone with electric circuitry therefor
  • H04R 19/00 - Electrostatic transducers
  • H04R 31/00 - Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor
  • H04R 1/08 - Mouthpieces; Attachments therefor

37.

ACOUSTIC VALVE FOR HEARING DEVICE

      
Application Number US2019027155
Publication Number 2019/200211
Status In Force
Filing Date 2019-04-12
Publication Date 2019-10-17
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Jones, Christopher
  • Monti, Christopher
  • Albahri, Shehab

Abstract

Acoustic valves include a housing having an acoustic inlet, an acoustic outlet, and an acoustic passage between the inlet and the outlet. An electrical coil is disposed in the housing and configured to generate a magnetic field when energized by an actuation signal. A spring is coupled to an armature movably disposed in the housing between a first surface and a second surface. The valve has a first stable state wherein the armature is positioned against one surface when the electrical coil is not energized, and the valve has a second stable state wherein the armature is positioned against the other surface when the electrical coil is not energized. The armature is movable between the first and second states when the electrical coil is energized, wherein the acoustic passage is more obstructed when the armature is in one state than when the armature is in the other state.

IPC Classes  ?

  • H04R 25/00 - Deaf-aid sets
  • H04R 1/28 - Transducer mountings or enclosures designed for specific frequency response; Transducer enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
  • H04R 1/10 - Earpieces; Attachments therefor

38.

AUDIO DEVICE WITH CONDUIT CONNECTOR

      
Application Number US2019025302
Publication Number 2019/195224
Status In Force
Filing Date 2019-04-02
Publication Date 2019-10-10
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Varanda, Brenno
  • Albahri, Shehab

Abstract

A hearing device includes a housing with a retention flange defining a retention space. A conduit is disposed about an electrical wire electrically coupled to a transducer and a ferrule is disposed about an end portion of the conduit and fixed along an axial dimension of the conduit, the ferrule having a portion disposable in the retention space. A bushing has a portion disposed at least partially about the portion of the ferrule disposable in the retention space, the bushing formed of a soft material relative to a hardness of the ferrule and the housing, wherein the bushing is located between the retention flange and the ferrule and the retention flange captures the conduit relative to the housing when the portion of the bushing is disposed in the retention space.

IPC Classes  ?

39.

DIELECTRIC COMB FOR MEMS DEVICE

      
Application Number US2019023260
Publication Number 2019/183283
Status In Force
Filing Date 2019-03-20
Publication Date 2019-09-26
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Nawaz, Mohsin
  • Shubham, Shubham
  • Schafer, David
  • Pedersen, Michael
  • Fürst, Claus
  • Shajaan, Mohammad
  • Cech, Jay

Abstract

Microphones including a housing defining a cavity, a plurality of conductors positioned within the cavity, at least one dielectric bar positioned within the cavity, and a transducer diaphragm. The conductors are structured to move in response to pressure changes while the housing remains fixed. A first conductor generates first electrical signals responsive to the pressure changes resulting from changes in an atmospheric pressure. A second conductor generates second electrical signals responsive to the pressure changes resulting from acoustic activity. The dielectric bar is fixed with respect to the cavity and remains fixed under the pressure changes. The dielectric bar is adjacent to at least one of the conductors. In response to an applied pressure that is an atmospheric pressure and/or an acoustic pressure, the transducer diaphragm exerts a force on the housing and displaces at least a portion of conductors with respect to the dielectric bar.

IPC Classes  ?

  • H04R 19/04 - Microphones
  • B81B 3/00 - Devices comprising flexible or deformable elements, e.g. comprising elastic tongues or membranes
  • H04R 19/00 - Electrostatic transducers
  • G01L 9/00 - Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means

40.

DATA DRIVEN ECHO CANCELLATION AND SUPPRESSION

      
Application Number US2019013923
Publication Number 2019/143759
Status In Force
Filing Date 2019-01-17
Publication Date 2019-07-25
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Shah, Pratik
  • Parvaix, Mathieu
  • Woodruff, John
  • Rao, Harsha

Abstract

The present embodiments are directed to removing echo from an audio signal using a two-stage process. The first stage aims at removing the linear portion of the echo signal that is representative of the acoustic propagation path between a loudspeaker and a microphone, for example. The second stage focuses on removing or suppressing any remaining or residual echo in the audio signal. The residual echo can include both residual linear echo and nonlinear contributions from the system, such as nonlinear echo produced by loudspeakers, amplifiers, microphones or even the body of the device itself. According to certain additional aspects, the echo cancellation and suppression techniques of the embodiments are built on a data-driven approach, where models are trained in both an offline and online process to assist in the detection and suppression of various forms of echo that can exist in a particular near-end environment.

IPC Classes  ?

41.

PRESSURE SENSING MICROPHONE DEVICE

      
Application Number US2018068206
Publication Number 2019/136032
Status In Force
Filing Date 2018-12-31
Publication Date 2019-07-11
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Chandrasekaran, Venkataraman
  • Lillelund, Christian
  • Fürst, Claus Erdmann
  • Shajaan, Mohammad

Abstract

This disclosure provides methods, systems, and apparatuses, for a microphone circuit. In particular, the circuit includes transducer that can sense pressure changes and generate an electrical signal having frequency components in a first frequency range and in a second frequency range higher than the first frequency range. The circuit includes a feedback circuitry that can attenuate frequency components in the first frequency range in the electrical signal and, from it, generate an audio signal. A feedback path circuit includes a low pass filter having a cut-off frequency within the first frequency range, and filters the audio signal to generate a low pass filter signal that includes frequency components in the first frequency range. The low pass filter signal can be used to generate a low frequency pressure signal that corresponds to low frequency pressure changes sensed by the transducer.

IPC Classes  ?

  • H04R 1/08 - Mouthpieces; Attachments therefor
  • H04R 1/22 - Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
  • H04R 19/00 - Electrostatic transducers
  • H04R 3/06 - Circuits for transducers for correcting frequency response of electrostatic transducers
  • H04R 17/02 - Microphones
  • H04R 19/01 - Electrostatic transducers characterised by the use of electrets
  • H04R 19/04 - Microphones
  • H04R 3/00 - Circuits for transducers

42.

CONTENT-BASED AUDIO STREAM SEPARATION

      
Application Number US2018067721
Publication Number 2019/133732
Status In Force
Filing Date 2018-12-27
Publication Date 2019-07-04
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Woodruff, John
  • Parvaix, Mathieu
  • Shah, Pratik

Abstract

A method for separating audio signals based on categories is disclosed herein. The method includes receiving an audio signal; generating a plurality of filters based on the audio signal, each of the filters corresponding to one of a plurality of sound content categories; and separating the audio signal into a plurality of content-based audio signals by applying the filters to the audio signal, each of the content-based audio signals contains a content of a corresponding sound content category among the plurality of sound content categories.

IPC Classes  ?

  • G10L 25/30 - Speech or voice analysis techniques not restricted to a single one of groups characterised by the analysis technique using neural networks
  • G10L 21/038 - Speech enhancement, e.g. noise reduction or echo cancellation using band spreading techniques

43.

DIRECTION OF ARRIVAL ESTIMATION FOR MULTIPLE AUDIO CONTENT STREAMS

      
Application Number US2018067762
Publication Number 2019/133765
Status In Force
Filing Date 2018-12-27
Publication Date 2019-07-04
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Woodruff, John
  • Shah, Pratik
  • Pulugurtha, Sai Ravi Teja
  • Rao, Harsha

Abstract

A method for estimating directions of arrival of audio signals based on categories is disclosed herein. The method includes receiving an audio signal; generating a plurality of filters based on the audio signal, each of the filters corresponding to one of a plurality of sound content categories; separating the audio signal into a plurality of content-based audio signals by applying the filters to the audio signal, each of the content-based audio signals contains a content of a corresponding sound content category among the plurality of sound content categories; for each of the content-based audio signals, generating a direction of arrival (DOA) for a sound source of the content-based audio signal.

IPC Classes  ?

  • G10L 25/30 - Speech or voice analysis techniques not restricted to a single one of groups characterised by the analysis technique using neural networks
  • G10L 21/028 - Voice signal separating using properties of sound source
  • G01S 3/80 - Direction-finders for determining the direction from which infrasonic, sonic, ultrasonic, or electromagnetic waves, or particle emission, not having a directional significance, are being received using ultrasonic, sonic, or infrasonic waves

44.

BACK VOLUME FREE SENSOR PACKAGE

      
Application Number US2018067561
Publication Number 2019/133644
Status In Force
Filing Date 2018-12-26
Publication Date 2019-07-04
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Beard, John James Lorimer
  • Du, Yu

Abstract

A sensor device includes a base having a front surface and an opposing back surface. The base defines a bottom port extending between the front surface and the back surface. The sensor further includes a microelectromechanical systems (MEMS) transducer disposed over the base over the bottom port and an integrated circuit (IC) disposed over the base. The sensor also includes an acoustically transparent cover disposed on the base covering the MEMS transducer and the IC. The acoustically transparent cover is configured to provide high acoustic permittivity.

IPC Classes  ?

  • H04R 19/00 - Electrostatic transducers
  • B81C 1/00 - Manufacture or treatment of devices or systems in or on a substrate
  • H04R 19/04 - Microphones

45.

RECONFIGURABLE MICROPHONE ASSEMBLY

      
Application Number US2018067562
Publication Number 2019/133645
Status In Force
Filing Date 2018-12-26
Publication Date 2019-07-04
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Dai, Wei-Wen
  • Ryan, William

Abstract

Disclosed herein are related to various embodiments of a reconfigurable transducer assembly and a method of operating the same. The transducer assembly includes a transducer and an electrical circuit coupled to the transducer. The transducer generates an electrical signal electrically representing a sensed result sensed by the transducer. The electrical circuit performs signal processing (e.g., sampling, amplification, filtering, etc.) on the electrical signal to obtain an output signal according to a process setting specifying how to perform the signal processing.

IPC Classes  ?

  • G06F 13/42 - Bus transfer protocol, e.g. handshake; Synchronisation
  • H04R 19/00 - Electrostatic transducers
  • H04R 3/00 - Circuits for transducers

46.

TRANSDUCER ASSEMBLY FAULT DETECTION

      
Application Number US2018067572
Publication Number 2019/133646
Status In Force
Filing Date 2018-12-26
Publication Date 2019-07-04
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Loeppert, Peter
  • Chandrasekaran, Venkataraman
  • Furst, Claus
  • Barry, Daryl
  • Pedersen, Michael
  • Badillo, Dean

Abstract

A micro-electromechanical system (MEMS) transducer assembly includes a transducer including a condenser microphone, an integrated circuit electrically connected to the transducer to receive an output voltage from the transducer, wherein the integrated circuit comprises a test signal generator configured to induce a test acoustic response in the transducer, and an evaluation circuit configured to compare the test acoustic response to a baseline acoustic response to identify a fault in the transducer.

IPC Classes  ?

47.

SECURE MICROPHONE

      
Application Number US2018065922
Publication Number 2019/125988
Status In Force
Filing Date 2018-12-17
Publication Date 2019-06-27
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Jin, Minho
  • Heo, Inseok
  • Ivanov, Alexi
  • Tiong, Francis
  • Singh, Navjot
  • Paturi, Rohit
  • Nemala, Sridhar Krishna

Abstract

The present disclosure describes devices and methods for improving security of an audio signal generated by a microphone by encrypting the audio signal. In one aspect, a microphone assembly converts a sound into an encrypted audio signal, and outputs the encrypted audio signal through contacts of the microphone assembly. The microphone assembly may be electrically insulated, and only electrically communicate with other electronic devices through the contacts. Because the output of the microphone assembly through the contacts is encrypted, the audio signal can thus be secured.

IPC Classes  ?

  • H04R 19/00 - Electrostatic transducers
  • G06F 21/83 - Protecting input, output or interconnection devices input devices, e.g. keyboards, mice or controllers thereof
  • H04L 29/06 - Communication control; Communication processing characterised by a protocol
  • H04R 19/04 - Microphones

48.

SENSOR PACKAGE WITH INGRESS PROTECTION

      
Application Number US2018060858
Publication Number 2019/099414
Status In Force
Filing Date 2018-11-13
Publication Date 2019-05-23
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Lim, Tony K.
  • Talag, Norman Dennis

Abstract

A sensor device includes a substrate having a front surface and an opposing back surface. The back surface defines an indented region having an indented surface. The substrate defines a bottom port extending between the front surface and the indented surface. The sensor further includes a microelectromechanical systems (MEMS) transducer mounted on the front surface of the substrate over the bottom port. The sensor also includes a filtering material disposed on the indented surface and covering the bottom port. The filtering material provides resistance to ingression of solid particles or liquids into the sensor device. The filtering material is configured to provide high acoustic permittivity and have low impact on a signal-to-noise ratio of the sensor device.

IPC Classes  ?

  • B81B 7/00 - Microstructural systems
  • G01L 9/00 - Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
  • G01L 19/14 - Housings
  • H04R 1/08 - Mouthpieces; Attachments therefor
  • H04R 19/00 - Electrostatic transducers

49.

MULTI-CORE AUDIO PROCESSOR WITH PHASE COHERENCY

      
Application Number US2018052340
Publication Number 2019/067335
Status In Force
Filing Date 2018-09-24
Publication Date 2019-04-04
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Alvarado, Erick
  • Rossum, David

Abstract

A multi-core audio processor includes a plurality of data ports configured to receive and transmit data, wherein a first data port of the plurality of data ports is configured to receive data associated with a first stream, a first plurality of audio interface resources configured to perform operations on the data, and a multiplexing unit configured to route data between the plurality of data ports and the first plurality of audio interface resources, the multiplexing unit including a multiplexer associated with each of the first plurality of audio interface resources. The multi-core audio processor also includes a first plurality of transport buffers, at least one transport buffer associated with each of the first plurality of audio interface resources. A first set of buffers of the first plurality of transport buffers is configured to synchronously store data received from the first set of the first plurality of audio interface resources.

IPC Classes  ?

  • G06F 15/16 - Combinations of two or more digital computers each having at least an arithmetic unit, a program unit and a register, e.g. for a simultaneous processing of several programs

50.

MULTI-CORE AUDIO PROCESSOR WITH LOW-LATENCY SAMPLE PROCESSING CORE

      
Application Number US2018052346
Publication Number 2019/067337
Status In Force
Filing Date 2018-09-24
Publication Date 2019-04-04
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Rub, Leonardo
  • Clark, Brian

Abstract

A multi-core audio processor includes a data protocol interface configured to receive a stream of audio data, a plurality of data processing cores including a single sample processing core and a block data processing core, an audio fabric block configured to route samples of the stream between the data protocol interface and the plurality of data processing cores. The single sample processing core includes an execution unit configured to execute one or more low latency instructions for performing computations for the samples.

IPC Classes  ?

  • G06F 15/78 - Architectures of general purpose stored program computers comprising a single central processing unit

51.

MULTI-CORE AUDIO PROCESSOR WITH DEADLINE SCHEDULER

      
Application Number US2018052348
Publication Number 2019/067338
Status In Force
Filing Date 2018-09-24
Publication Date 2019-04-04
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Alvarado, Erik
  • Chen, Xiaojun
  • Rossum, Dave
  • Warren, Niel

Abstract

A multi-core audio processor includes a plurality of audio processing cores having differing capabilities, a plurality of buffers, wherein each buffer is configured to store a plurality of samples associated with a corresponding audio stream, a deadline scheduler including a plurality of deadline registers configured to store a plurality of deadline values for each audio stream, and a plurality of audio processing core interfaces coupling the plurality of audio processing cores to the deadline scheduler, each of the audio processing core interfaces associated with a corresponding audio processing core. The plurality of deadline values indicate an order of processing of samples stored in the plurality of buffers by the plurality of processing cores.

IPC Classes  ?

  • G06F 9/48 - Program initiating; Program switching, e.g. by interrupt

52.

MULTI-CORE AUDIO PROCESSOR WITH FLEXIBLE MEMORY ALLOCATION

      
Application Number US2018052338
Publication Number 2019/067334
Status In Force
Filing Date 2018-09-24
Publication Date 2019-04-04
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Wolf, Christopher
  • Shah, Malav
  • Raynal, Frederic
  • Mahnken, Sean

Abstract

A multi-core audio processor includes an audio fabric block configured to organize data received from a plurality of audio interfaces into streams for processing by a plurality of digital signal processing cores. The plurality of digital signal processing cores include a single sample processing core and a frame processing core. The multi-core audio processor also includes a pool of undedicated random access memory (RAM) and a main controller configured to dynamically allocate memory resources from the pool of undedicated RAM amongst one or more of the plurality of digital signal processing cores.

IPC Classes  ?

  • G06F 9/50 - Allocation of resources, e.g. of the central processing unit [CPU]
  • G06F 12/02 - Addressing or allocation; Relocation
  • G06F 12/06 - Addressing a physical block of locations, e.g. base addressing, module addressing, address space extension, memory dedication

53.

ELEVATED MEMS DEVICE IN A MICROPHONE WITH INGRESS PROTECTION

      
Application Number US2018052030
Publication Number 2019/060599
Status In Force
Filing Date 2018-09-20
Publication Date 2019-03-28
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Albers, John J.
  • Harrington, Brandon
  • Lee, Sung Bok

Abstract

A micro electro mechanical system (MEMS) microphone includes a base including a port extending through the base, a shim assembly, an ingress protection element, and a MEMS device. The shim assembly is disposed on the base and over the port. The shim assembly has a plurality of walls that form a hollow interior cavity. The shim assembly also has a top surface and a bottom surface coupled to the base. The ingress protection element extends over and is coupled to the top of the shim assembly to enclose the cavity of the shim assembly. The shim assembly elevates the ingress protection element above the base and is effective to prevent the passage of contaminants there through. The MEMS device includes a diaphragm and a back plate and is disposed over the ingress protection element.

IPC Classes  ?

54.

COST EFFECTIVE MICROPHONE ARRAY DESIGN FOR SPATIAL FILTERING

      
Application Number US2018051362
Publication Number 2019/060251
Status In Force
Filing Date 2018-09-17
Publication Date 2019-03-28
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Radmanesh, Nasim
  • Gadonniex, Sharon

Abstract

An audio system includes an array of microphones and an audio processing system. The array of microphones includes a plurality of microphones configured to record a plurality of sound signals based on sound waves emanating from a sound source. The audio processing system includes a direction of arrival (DOA) estimator configured to generate an estimation of a DOA of the sound waves emanating from the sound source based on the plurality of sound signals, a statistical subset selector configured to select a subset of the plurality of microphones based on the estimation of the DOA, and a spatial filter configured to modify and combine a set of sound signals associated with the selected subset of the plurality of microphones to produce an audio output associated with the sound source.

IPC Classes  ?

55.

MICROPHONE PACKAGE

      
Application Number US2018050533
Publication Number 2019/055437
Status In Force
Filing Date 2018-09-11
Publication Date 2019-03-21
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Lim, Tony K.
  • Szczech, John
  • Watson, Joshua

Abstract

A microphone includes a substrate defining an embedded cavity between a first surface of the substrate and an opposing second surface of the substrate, the first surface defining a first opening into the embedded cavity, a distance between the first surface and the second surface defining a substrate thickness. A cover is disposed over the first surface of the substrate and forms a housing, the cover including a port, the substrate thickness being greater than a height of the cover from the first surface of the substrate. A microelectromechanical systems (MEMS) transducer is disposed in the housing and mounted on the first surface of the substrate over the first opening, and an integrated circuit (IC) is disposed in the housing and electrically coupled to the MEMS transducer. The MEMS transducer and the IC are disposed in a front volume of the housing defined by the cover and the substrate.

IPC Classes  ?

  • H04R 19/00 - Electrostatic transducers
  • H04R 19/04 - Microphones
  • H04R 31/00 - Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor

56.

SYSTEM AND METHOD FOR ACOUSTIC HOLE OPTIMIZATION

      
Application Number US2018051194
Publication Number 2019/055858
Status In Force
Filing Date 2018-09-14
Publication Date 2019-03-21
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Naderyan, Vahid
  • Kuntzman, Michael
  • Lee, Sung Bok
  • Conklin, Wade

Abstract

A microphone assembly includes an acoustic transducer having a back plate and a diaphragm, such that a surface of the back plate includes a plurality of holes. At least a portion of the plurality of holes are arranged in a non-uniform pattern. The non-uniform pattern includes holes of varying sizes spaced apart from neighboring holes by varying distances. The microphone assembly further includes an audio signal electrical circuit configured to receive an acoustic signal from the acoustic transducer.

IPC Classes  ?

57.

CLOCK SYNCHRONIZATION IN A MASTER-SLAVE COMMUNICATION SYSTEM

      
Application Number US2018049941
Publication Number 2019/051218
Status In Force
Filing Date 2018-09-07
Publication Date 2019-03-14
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Fitting, Andrew
  • Warren, Niel
  • Knapen, Geert

Abstract

Disclosed herein include a system and a method of synchronizing a slave device to a signal from a master device based on pulse width analysis. The pulse width analysis is a process to sample the signal at a sampling frequency of the slave device, determine varying pulse widths of the sampled signal, and determine frequency of an embedded master clock signal of the signal based on statistical analysis of the varying pulse widths. Advantageously, performing pulse width analysis allows synchronization of a slave device with the embedded master clock signal in a time and cost efficient manner. In one aspect, determining a frequency of the embedded master clock signal and adjusting an internal clock of the slave device according to the determined frequency is faster and more cost efficient than iteratively adjusting the internal clock based on feedback loop based circuitries.

IPC Classes  ?

  • H04J 3/06 - Synchronising arrangements
  • H04L 25/49 - Transmitting circuits; Receiving circuits using three or more amplitude levels

58.

DIGITAL MICROPHONE NOISE ATTENUATION

      
Application Number US2018049933
Publication Number 2019/051211
Status In Force
Filing Date 2018-09-07
Publication Date 2019-03-14
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Thomsen, Henrik
  • Du, Yu

Abstract

A digital microphone device includes circuitry that can reduce the risk of noise caused due to an idle tone frequency component in a digital signal output by the digital microphone device. In stereo mode and other applications where interference occurs between two or more such microphones, each microphone device includes a digital output having a corresponding idle tone frequency, one of which is offset to shift noise components outside of a desired frequency range.

IPC Classes  ?

  • H04R 19/00 - Electrostatic transducers
  • H03M 3/00 - Conversion of analogue values to or from differential modulation
  • H03M 7/30 - Compression; Expansion; Suppression of unnecessary data, e.g. redundancy reduction
  • H04R 19/04 - Microphones

59.

CONTACT INTERFACE DEVICE WITH TRAPPED AIR SENSOR

      
Application Number US2018047450
Publication Number 2019/040577
Status In Force
Filing Date 2018-08-22
Publication Date 2019-02-28
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Volk, Martin
  • Qutub, Sarmad
  • Dektor, Shandor

Abstract

A control panel device is disclosed herein. The control panel device includes a circuit board, an enclosure member (e.g., gasket), a top plate and one or more pressure sensors (e.g., MEMS microphones). The enclosure member is attached to the circuit board. The top plate is disposed on the enclosure member. The enclosure member defines one or more air chambers. The pressure sensors are attached to the circuit board and are configured to detect pressure changes of the air pockets of the respective air chambers and to generate signals corresponding to the pressure changes. The control panel detects a touch on the top plate based on one or more signals generated by at least one of the pressure sensors.

IPC Classes  ?

  • G06F 3/041 - Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
  • G06F 3/043 - Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using propagating acoustic waves

60.

ACOUSTIC RELIEF IN MEMS

      
Application Number US2018043799
Publication Number 2019/023409
Status In Force
Filing Date 2018-07-26
Publication Date 2019-01-31
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Kueffner, Alyssa
  • Lee, Sung Bok
  • Chen, Yenhao
  • Guo, Yaoyang
  • Hui, Jeremy
  • Albers, John
  • Reeg, Jonathan

Abstract

A microelectromechanical system (MEMS) motor includes a substrate, a backplate, and a diaphragm. The substrate has a first surface and a second surface. The second surface has a slot that extends at least partially into the substrate. A port extends through the substrate. The backplate is mounted to the first surface of the substrate, and the backplate covers at least a portion of the port. The diaphragm is between the backplate and the substrate. The diaphragm moves with respect to the backplate in response to acoustic energy that passes through the port.

IPC Classes  ?

  • H04R 1/04 - Structural association of microphone with electric circuitry therefor
  • H04R 19/04 - Microphones
  • B81B 3/00 - Devices comprising flexible or deformable elements, e.g. comprising elastic tongues or membranes

61.

ACOUSTIC RECEIVER AND METHOD OF MAKING SAME

      
Application Number US2018041921
Publication Number 2019/014510
Status In Force
Filing Date 2018-07-13
Publication Date 2019-01-17
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Albahri, Shehab
  • Dayton, Paul
  • Miller, Thomas

Abstract

An acoustic receiver includes a first receiver subassembly having bottom housing plate with at least a portion of a motor fastened thereto, and a second receiver subassembly having a closed-ended housing wall with at least one open end that is fastened to the bottom housing plate. A method of making and assembling the components is also described.

IPC Classes  ?

  • H04R 11/04 - Microphones
  • H04R 31/00 - Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor

62.

POST LINEARIZATION SYSTEM AND METHOD USING TRACKING SIGNAL

      
Application Number US2018039617
Publication Number 2019/005885
Status In Force
Filing Date 2018-06-26
Publication Date 2019-01-03
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Berthelsen, Kim Spetzler
  • Kuntzman, Michael
  • Furst, Claus
  • Lee, Sung Bok
  • Shajaan, Mohammad
  • Chandrasekaran, Venkataraman

Abstract

A microphone assembly includes an acoustic transducer and an audio signal electrical circuit configured to receive an output signal from the acoustic transducer. The output signal includes an audio signal component and a tracking signal component. The audio signal component is representative of an acoustic signal detected by the acoustic transducer and the tracking signal component is based on an input tracking signal applied to the acoustic transducer. The audio signal electrical circuit includes an analog to digital converter configured to convert the output signal into a digital signal, an extraction circuit configured to separate the tracking signal component and the audio signal component from the digital signal, an envelope estimation circuit configured to estimate a tracking signal envelope from the tracking signal component, and a signal correction circuit configured to reduce distortion in the audio signal component using the tracking signal envelope.

IPC Classes  ?

63.

ADAPTIVE ACOUSTIC ECHO DELAY ESTIMATION

      
Application Number US2018035375
Publication Number 2018/231534
Status In Force
Filing Date 2018-05-31
Publication Date 2018-12-20
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Deshpande, Murali Mohan
  • Pattathil, Sarath

Abstract

A method for acoustic echo cancellation is disclosed herein. A microphone receives a second acoustic signal from a near-end environment, the second acoustic signal including a delayed version of the first acoustic signal from a far-end environment. A processor models a relationship between the first acoustic signal and the second acoustic signal using an adaptive filter. The adaptive filter uses sampling points of the first acoustic signal and the second acoustic signal along a timeline as inputs. The processor identifies a sampling point among the sampling points, wherein weight values of the adaptive filter associated with the identified sampling point experience a significant increase (e.g., 50% increase). The identified sampling point along the timeline represents an estimated delay between the first acoustic signal and the second acoustic signal. The processor further removes the delayed version of the first acoustic signal from the second acoustic signal based on the estimated delay.

IPC Classes  ?

  • H04M 9/08 - Two-way loud-speaking telephone systems with means for conditioning the signal, e.g.  for suppressing echoes for one or both directions of traffic

64.

MICROPHONE PACKAGE FOR FULLY ENCAPSULATED ASIC AND WIRES

      
Application Number US2018034475
Publication Number 2018/218073
Status In Force
Filing Date 2018-05-24
Publication Date 2018-11-29
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Lim, Tony K.
  • Szczech, John
  • Watson, Joshua

Abstract

A microphone device includes a substrate having a cavity. The device also includes a microelectromechanical systems (MEMS) transducer mounted on the substrate outside of the cavity and an application specific integrated circuit mounted in the cavity. A first set of bonding wires connect the MEMS transducer to the ASIC and a second set of bonding wires connect the ASIC to a conductor within the cavity. An encapsulating material completely covers the ASIC and at least a portion of the second set of wires and is substantially confined within the cavity. A cover is installed over the substrate to cover the MEMS transducer, the encapsulating material, the ASIC, the first set of bonding wires, and the second set of bonding wires.

IPC Classes  ?

  • H04R 1/04 - Structural association of microphone with electric circuitry therefor
  • H01L 23/28 - Encapsulation, e.g. encapsulating layers, coatings
  • B81B 7/00 - Microstructural systems

65.

VOICE ACTIVITY DETECTOR AND METHODS THEREFOR

      
Application Number US2018017700
Publication Number 2018/152034
Status In Force
Filing Date 2018-02-09
Publication Date 2018-08-23
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Paturi, Rohit
  • Ye, Anne
  • Rub, Leonardo
  • Laroche, Jean
  • Nemala, Sridhar Krishna

Abstract

Methods, systems, and apparatuses for a low-complexity acoustic activity detector are disclosed. A method includes forming a sequence of frames by blocking digital data representative of acoustic activity. For each frame, the method includes determining a plurality of power metrics based on a transformation of the frame data from the time-domain to the frequency domain using a discrete Fourier transform having constant coefficients dependent on a plurality of select frequencies within a range of voice frequencies. For each frame, the method also includes determining a plurality of signal to noise ratios for each power metric to a corresponding noise metric. The method also includes, for each frame, determining one or more signal to noise ratios. The method includes determining whether the digital data representative of the acoustic activity includes voice activity by determining whether the signal to noise ratios for each of a plurality of frames satisfies a criterion.

IPC Classes  ?

  • G10L 15/20 - Speech recognition techniques specially adapted for robustness in adverse environments, e.g. in noise or of stress induced speech
  • G10L 15/22 - Procedures used during a speech recognition process, e.g. man-machine dialog
  • G10L 25/03 - Speech or voice analysis techniques not restricted to a single one of groups characterised by the type of extracted parameters
  • G10L 25/18 - Speech or voice analysis techniques not restricted to a single one of groups characterised by the type of extracted parameters the extracted parameters being spectral information of each sub-band
  • G10L 25/21 - Speech or voice analysis techniques not restricted to a single one of groups characterised by the type of extracted parameters the extracted parameters being power information
  • G10L 25/78 - Detection of presence or absence of voice signals
  • G10L 25/84 - Detection of presence or absence of voice signals for discriminating voice from noise
  • G10L 25/87 - Detection of discrete points within a voice signal
  • H04R 3/00 - Circuits for transducers
  • G06F 17/14 - Fourier, Walsh or analogous domain transformations

66.

SYSTEM AND METHOD FOR CALIBRATING MICROPHONE CUT-OFF FREQUENCY

      
Application Number US2018017458
Publication Number 2018/152003
Status In Force
Filing Date 2018-02-08
Publication Date 2018-08-23
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Berthelsen, Kim Spetzler
  • Shajaan, Mohammad
  • Furst, Claus

Abstract

A system and method in an audio signal electrical circuit including a feedback loop with a digital filter coupled to a current digital to analog converter (IDAC) includes providing an output signal from the IDAC to analog elements of the audio signal electrical circuit, the output signal from the IDAC based upon a reference signal input to the IDAC when an output of the digital filter is not input to the IDAC. The system and method also include comparing an output signal of the audio signal electrical circuit to a reference, and calibrating the audio signal electrical circuit to correspond the output signal of the audio signal electrical circuit to the reference. Calibration of the audio signal electrical circuit enables more precise control of a cut-off frequency of a microphone signal when the output of the digital filter is input to the IDAC.

IPC Classes  ?

  • H03G 5/16 - Automatic control
  • H04R 3/02 - Circuits for transducers for preventing acoustic reaction

67.

SOFT-TALK AUDIO CAPTURE FOR MOBILE DEVICES

      
Application Number US2018016435
Publication Number 2018/148095
Status In Force
Filing Date 2018-02-01
Publication Date 2018-08-16
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Ray, Jonathon
  • Yadav, Anil Kumar

Abstract

A method for reducing noise within an acoustic signal includes receiving at least a primary acoustic signal from a primary microphone and a secondary acoustic signal from a different, secondary microphone, wherein the primary acoustic signal includes a speech component emanating from a user and a noise component. The method also includes measuring a first value of a first coefficient based on the primary and secondary signals and performing a noise cancellation process based on the measured first value of the first coefficient to produce a set of noise-cancelled primary sub-bands. The method also includes generating, by the processor, a set of multiplicative gain mask values, the multiplicative gain mask values having a frequency dependency that is based at least in part on a pre-indicated approximate sound pressure level of the speech component.

IPC Classes  ?

68.

DIAPHRAGM FOR AN ACOUSTIC RECEIVER, COMBINATIONS THEREOF AND METHODS THEREFOR

      
Application Number US2018017536
Publication Number 2018/148485
Status In Force
Filing Date 2018-02-09
Publication Date 2018-08-16
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Dayton, Paul
  • Monti, Christopher
  • Salazar, Jose
  • Albahri, Shehab
  • Warren, Daniel
  • King, Charles
  • Gabel, Christopher

Abstract

In accordance with one aspect, a diaphragm for an acoustic receiver is provided that includes a frame, a paddle flexibly coupled to the frame, and a gap between a portion of the paddle and the frame. The diaphragm further includes siloxane material coupled to at least a portion of the paddle and to at least a portion of the frame. The siloxane material covers the gap. In another aspect, a method is provided for making an acoustic receiver diaphragm.

IPC Classes  ?

  • H04R 7/04 - Plane diaphragms
  • H04R 11/02 - Loudspeakers
  • H04R 31/00 - Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor

69.

LOAD CHANGE DIAGNOSTICS FOR ACOUSTIC DEVICES AND METHODS

      
Application Number US2018012472
Publication Number 2018/129242
Status In Force
Filing Date 2018-01-05
Publication Date 2018-07-12
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • King, Charles
  • Unruh, Andrew
  • Warren, Daniel

Abstract

An acoustic apparatus and method produces an acoustic signal in response to an electrical input signal applied to an acoustic receiver. The acoustic signal is converted to an electrical output signal that is proportional to a sound pressure of the acoustic signal, using an electro-acoustic transducer. In some embodiments the apparatus and method determine whether there is a change in the acoustic signal indicative of a change in an acoustic load coupled to the receiver by comparing the electrical output signal to reference information. The change in acoustic load, in one example, is attributable to ear wax accumulation in an output of the acoustic receiver or acoustic passage in the ear canal of a user or is attributable to seal leakage.

IPC Classes  ?

70.

MICROPHONE ASSEMBLY WITH AUTHENTICATION

      
Application Number US2017068980
Publication Number 2018/126151
Status In Force
Filing Date 2017-12-29
Publication Date 2018-07-05
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor Bowler, Ii, Roland K.

Abstract

A microphone assembly is disclosed including a microelectromechanical system (MEMS) transducer and an electrical circuit disposed in a housing having an external-device interface. The electrical circuit is configured to determine whether a speech characteristic is present in an electrical signal produced by the transducer, attempt to authenticate the speech characteristic, and provide an interrupt signal to the external device interface only upon successful authentication of the speech characteristic.

IPC Classes  ?

  • G06Q 20/40 - Authorisation, e.g. identification of payer or payee, verification of customer or shop credentials; Review and approval of payers, e.g. check of credit lines or negative lists

71.

MICROELECTROMECHANICAL SYSTEM MICROPHONE

      
Application Number US2017068324
Publication Number 2018/125839
Status In Force
Filing Date 2017-12-22
Publication Date 2018-07-05
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Nawaz, Mohsin
  • Kuntzman, Michael
  • Pedersen, Michael

Abstract

A microelectromechanical system (MEMS) includes a diaphragm with a first surface and a second surface. The first surface is exposed to an environmental pressure. The second surface comprises a plurality of fingers extending from the second surface. The MEMS also includes a backplate comprising a plurality of voids. Each of the plurality of fingers extends into a respective one of the plurality of voids. The MEMS further includes an insulator between a portion of the diaphragm and a portion of the backplate. The diaphragm is configured to move with respect to the backplate in response to changes in the environmental pressure.

IPC Classes  ?

72.

METHODS AND SYSTEMS FOR REDUCING FALSE ALARMS IN KEYWORD DETECTION

      
Application Number US2017066938
Publication Number 2018/118744
Status In Force
Filing Date 2017-12-18
Publication Date 2018-06-28
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor Laroche, Jean

Abstract

Systems and methods for reducing false alarms in keyword detection are provided. An example method includes detecting a keyword in an acoustic signal. The acoustic signal can represent at least one captured sound. The method also includes acquiring an estimate of speech activity for a portion of the acoustic signal preceding the keyword. In some embodiments, the estimate includes an average of a voice activity detection output over frames of the acoustic signal within the portion preceding the keyword. If the estimate is less than a threshold, the method can accept the keyword detection. If the estimate is larger than the threshold, the method proceeds to reject the keyword detection.

IPC Classes  ?

  • G10L 15/22 - Procedures used during a speech recognition process, e.g. man-machine dialog

73.

HIGH IMPEDANCE BIAS FOR MICROPHONES

      
Application Number US2017064037
Publication Number 2018/106514
Status In Force
Filing Date 2017-11-30
Publication Date 2018-06-14
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Hoomes, Ben
  • Fitting, Andrew
  • Lee, Patricia

Abstract

This disclosure provides methods, systems, and apparatuses, for a microelectromechanical (MEMS) acoustic microphone circuit. In particular, the circuit includes a high pass filter formed by a combination of a capacitive microphone and a bias resistor. The bias resistor can include a switched-capacitor resistor. The switched-capacitor resistor includes at least one capacitor and at least two switches switched at a switching frequency. The switched- capacitor resistor can include multiple stages, where each stage includes at least one capacitor and at least one switch. The cut-off frequency of the high-pass filter is a function of the number of stages. The cut-off frequency is also a function of the switching frequency.

IPC Classes  ?

  • H04R 1/22 - Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
  • H04R 3/06 - Circuits for transducers for correcting frequency response of electrostatic transducers
  • H04R 19/00 - Electrostatic transducers

74.

DIAPHRAGM FOR A RECEIVER

      
Application Number US2017065263
Publication Number 2018/106999
Status In Force
Filing Date 2017-12-08
Publication Date 2018-06-14
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Dayton, Paul
  • Zhang, Ya-Hui
  • Grossman, Alexander
  • Albahri, Shehab
  • Manley, Matthew

Abstract

An acoustic receiver diaphragm includes a frame with an opening extending therethrough. A paddle is disposed in the opening, and a gap extends between portions of the paddle and the frame. A hinge connects the paddle to the frame. The hinge has a coined portion, and the paddle is movable relative to the frame upon flexing the coined portion of the hinge. A portion of the frame, the paddle, and the hinge form an unassembled, single-piece substantially planar member.

IPC Classes  ?

  • H04R 11/02 - Loudspeakers
  • H04R 7/04 - Plane diaphragms
  • H04R 1/10 - Earpieces; Attachments therefor
  • H04R 1/24 - Structural combinations of separate transducers or of parts of the same transducer and responsive respectively to two or more frequency ranges

75.

RAMPING OF SENSOR POWER IN A MICROELECTROMECHANICAL SYSTEM DEVICE

      
Application Number US2017064036
Publication Number 2018/106513
Status In Force
Filing Date 2017-11-30
Publication Date 2018-06-14
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Furst, Claus
  • Chandrasekaran, Venkataraman

Abstract

A microelectromechanical system (MEMS) device includes at least one substrate, a lid, a MEMS component, a sensor, and a power supply. The lid is coupled to the substrate so that the substrate and the lid cooperatively define an interior cavity. The MEMS component is disposed within the interior cavity. The sensor is disposed within the interior cavity and is arranged to detect a parameter of the interior cavity. The power supply provides current to the sensor. The power supply is configured to control current during a ramp-up transition of the current and a ramp-down transition of the current such that the ramp-up transition and the ramp-down transition have attenuated high-frequency components.

IPC Classes  ?

  • B81B 7/02 - Microstructural systems containing distinct electrical or optical devices of particular relevance for their function, e.g. microelectro-mechanical systems (MEMS)
  • B81B 7/04 - Networks or arrays of similar microstructural devices
  • G01L 27/02 - Testing or calibrating of apparatus for measuring fluid pressure of indicators
  • G01L 23/12 - Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid operated electrically by changing capacitance or inductance
  • H04R 19/04 - Microphones
  • H04R 1/04 - Structural association of microphone with electric circuitry therefor
  • H04R 19/01 - Electrostatic transducers characterised by the use of electrets

76.

METHODS AND SYSTEMS FOR LOCATING THE END OF THE KEYWORD IN VOICE SENSING

      
Application Number US2017060833
Publication Number 2018/097969
Status In Force
Filing Date 2017-11-09
Publication Date 2018-05-31
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Laroche, Jean
  • Nemala, Sridhar
  • Srinivasan, Sundar
  • Gupta, Hitesh

Abstract

Systems and methods for locating the end of a keyword in voice sensing are provided. An example method includes receiving an acoustic signal that includes a keyword portion immediately followed by a query portion. The acoustic signal represents at least one captured sound. The method further includes determining the end of the keyword portion. The method further includes, separating, using the end of the keyword portion, the query portion from the keyword portion of the acoustic signal. The method further includes providing the query portion, absent any part of the keyword portion, to an automatic speech recognition (ASR) system.

IPC Classes  ?

  • G10L 15/04 - Segmentation; Word boundary detection

77.

STREAM SYNCHRONIZATION

      
Application Number US2017060372
Publication Number 2018/089352
Status In Force
Filing Date 2017-11-07
Publication Date 2018-05-17
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Chen, Xiaojun
  • Rossum, Dave

Abstract

Methods and systems for synchronizing audio streams. The method includes tagging a first presentation time to a frame buffer of a first audio stream and a second presentation time to a frame buffer of a second audio stream. The second audio stream is to be synchronized to the first audio stream. The method also includes aligning the second presentation time of the frame buffer of the second audio stream with the first presentation time of the frame buffer of the first audio stream, resampling the second audio stream so that each resampling point of the second stream is aligned with a corresponding sampling point in the first audio stream, and determining sample data for each resampling point of the second audio stream.

IPC Classes  ?

  • G06F 17/00 - Digital computing or data processing equipment or methods, specially adapted for specific functions
  • G10L 19/008 - Multichannel audio signal coding or decoding using interchannel correlation to reduce redundancy, e.g. joint-stereo, intensity-coding or matrixing
  • G10L 19/02 - Speech or audio signal analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using spectral analysis, e.g. transform vocoders or subband vocoders
  • G10L 19/022 - Blocking, i.e. grouping of samples in time; Choice of analysis windows; Overlap factoring
  • G11B 27/10 - Indexing; Addressing; Timing or synchronising; Measuring tape travel
  • H04L 7/00 - Arrangements for synchronising receiver with transmitter

78.

TRANSDUCER ASSEMBLIES AND METHODS

      
Application Number US2017058302
Publication Number 2018/081278
Status In Force
Filing Date 2017-10-25
Publication Date 2018-05-03
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Pawlowski, Andrzej
  • Wolf, Christopher Konrad
  • Warren, Niel D.

Abstract

A method in a transducer assembly having an external-device interface coupled to a communication protocol interface of the transducer assembly. The transducer assembly is configured to convert an input signal having one physical form to an output signal having a different physical form. At least two electrical signals are received on corresponding contacts of the external-device interface of the transducer assembly. A characteristic of at least one of the electrical signals is determined by evaluating a logic transition of the signal. A unique identity assigned to the transducer assembly is determined based on the characteristic.

IPC Classes  ?

  • H03F 3/68 - Combinations of amplifiers, e.g. multi-channel amplifiers for stereophonics
  • H04L 5/14 - Two-way operation using the same type of signal, i.e. duplex
  • H04L 5/16 - Half-duplex systems; Simplex/duplex switching; Transmission of break signals
  • H04L 61/20 -
  • G06F 13/38 - Information transfer, e.g. on bus
  • G06F 13/42 - Bus transfer protocol, e.g. handshake; Synchronisation

79.

USER INTERFACE INCORPORATING STRAIN GAUGES

      
Application Number US2017045955
Publication Number 2018/038913
Status In Force
Filing Date 2017-08-08
Publication Date 2018-03-01
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Dektor, Shandor
  • Unruh, Andrew
  • Ali, Asad
  • Verma, Tony

Abstract

A device includes a substrate, strain gauges, and a controller coupled to the strain gauges. The substrate has a front surface and an opposing rear surface, the front surface including a button representation and the rear surface including a button area corresponding to the button representation. The strain gauges are mounted on the rear surface in proximity to the button area. The controller receives information indicating multiple electrical signal amplitudes, each of the electrical signal amplitudes corresponding to one strain gauge of the plurality of strain gauges, each electrical signal amplitude representing an amount of deformation of the corresponding strain gauge. The controller estimates a location of a pressure applied and/or the magnitude of force applied on the front surface of the substrate based on the received information. The controller also can receive location information of multiple user presses from a separate set of sensors.

IPC Classes  ?

80.

METHODS AND SYSTEMS FOR KEYWORD DETECTION USING KEYWORD REPETITIONS

      
Application Number US2017047408
Publication Number 2018/039045
Status In Force
Filing Date 2017-08-17
Publication Date 2018-03-01
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Srinivasan, Sundararajan
  • Nemala, Sridhar Krishna
  • Laroche, Jean

Abstract

Systems and methods for keyword detection using keyword repetitions are provided. An example method includes receiving an acoustic signal representing at least one captured sound. Using a keyword model, a first confidence score for the first acoustic signal may be acquired. The method also includes determining the first confidence score is less than a detection threshold within a first value. In response, lowering the threshold by a second value for a pre-determined time interval. The method also includes receiving a second acoustic signal captured during the pre-determined time interval and acquiring a second confidence score for the second acoustic signal. The method also includes determining the second confidence score equals or exceeds the lowered threshold, and then confirming keyword detection. The threshold may be restored after the pre-determined time interval. The keyword model may be temporarily replaced by a tuned keyword model to facilitate keyword detection in low SNR conditions.

IPC Classes  ?

  • G10L 15/08 - Speech classification or search
  • G10L 15/10 - Speech classification or search using distance or distortion measures between unknown speech and reference templates

81.

MEMS ULTRASONIC TRANSDUCER

      
Application Number US2017044471
Publication Number 2018/026657
Status In Force
Filing Date 2017-07-28
Publication Date 2018-02-08
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Unruh, Andrew
  • Volk, Martin

Abstract

An ultrasonic device includes a substrate, a transmitter disposed over the substrate, the transmitter including an ultrasonic transmitting transducer configured to generate ultrasonic signals, and a receiver disposed over the substrate, the receiver including an ultrasonic receiving transducer configured to sense ultrasonic signals. The ultrasonic device further includes a first horn-shaped acoustic channel, wherein a material of at least one portion of the first horn-shaped acoustic channel is the same as a material of at least one portion of the transmitter or the receiver.

IPC Classes  ?

  • H04R 1/30 - Combinations of transducers with horns, e.g. with mechanical matching means
  • B06B 3/00 - Processes or apparatus specially adapted for transmitting mechanical vibrations of infrasonic, sonic or ultrasonic frequency
  • H03H 9/02 - Networks comprising electromechanical or electro-acoustic elements; Electromechanical resonators - Details

82.

PRESSURE SENSING APPARATUS WITH MEMS

      
Application Number US2017043530
Publication Number 2018/022508
Status In Force
Filing Date 2017-07-24
Publication Date 2018-02-01
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Unruh, Andrew
  • Lee, Sung Bok
  • Loeppert, Pete
  • Conklin, Wade
  • Kuntzman, Michael
  • Naderyan, Vahid

Abstract

In accordance with one aspect, a device is provided having a transducer comprising a conductor, a diaphragm configured to move relative to the conductor, and a reference volume in communication with the external environment. The diaphragm separates the reference volume and the external environment. The device further includes a controller operably coupled to the transducer and configured to determine an air pressure of an external environment based at least in part on movement of the diaphragm.

IPC Classes  ?

  • G01L 1/04 - Measuring force or stress, in general by measuring elastic deformation of gauges, e.g. of springs
  • G01L 1/10 - Measuring force or stress, in general by measuring variations of frequency of stressed vibrating elements, e.g. of stressed strings
  • G01L 1/14 - Measuring force or stress, in general by measuring variations in capacitance or inductance of electrical elements, e.g. by measuring variations of frequency of electrical oscillators
  • G01L 9/00 - Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
  • G01L 9/02 - Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means by making use of variations in ohmic resistance, e.g. of potentiometers
  • G01L 9/12 - Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means by making use of variations in capacitance
  • G01L 11/00 - Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group or
  • H01H 35/24 - Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow
  • H04R 1/00 - LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS - Details of transducers
  • H04R 1/04 - Structural association of microphone with electric circuitry therefor

83.

MICROELECTROMECHANICAL SYSTEM (MEMS) DEVICE PACKAGING

      
Application Number US2017043981
Publication Number 2018/022773
Status In Force
Filing Date 2017-07-26
Publication Date 2018-02-01
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Lim, Tony K.
  • Talag, Norman D.

Abstract

Systems, apparatuses, and methods for manufacturing a microelectromechanical system (MEMS) device. The MEMS device includes a substrate, a cap, a microelectromechanical component, and a tag. The substrate defines a port. The cap is coupled to the substrate. The substrate and the cap cooperatively define an interior cavity. The microelectromechanical component is disposed within the interior cavity and coupled to the substrate such that the microelectromechanical component is positioned over the port to at least partially isolate the port from the interior cavity. The tag is coupled to the substrate and the cap. The tag is positioned to secure the cap to the substrate.

IPC Classes  ?

  • B81C 1/00 - Manufacture or treatment of devices or systems in or on a substrate
  • H04R 19/00 - Electrostatic transducers

84.

DIGITAL MICROPHONE ASSEMBLY WITH IMPROVED FREQUENCY RESPONSE AND NOISE CHARACTERISTICS

      
Application Number US2017043372
Publication Number 2018/018002
Status In Force
Filing Date 2017-07-21
Publication Date 2018-01-25
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Shajaan, Mohammad
  • Fürst, Claus Erdmann
  • Høvesten, Per Flemming
  • Berthelsen, Kim Spetzler
  • Thomsen, Henrik

Abstract

A microphone assembly includes an acoustic transducer element configured to convert sound into a microphone signal in accordance with a transducer frequency response including a first highpass cut-off frequency. The microphone assembly additionally includes a processing circuit including a signal amplification path configured to receive, sample and digitize the microphone signal to provide a digital microphone signal. A frequency response of the signal amplification path includes a second highpass cut-off frequency which is higher than the first highpass cut-off frequency of the acoustic transducer element.

IPC Classes  ?

  • H04R 19/00 - Electrostatic transducers
  • H04R 3/06 - Circuits for transducers for correcting frequency response of electrostatic transducers

85.

SPLIT SIGNAL DIFFERENTIAL MEMS MICROPHONE

      
Application Number US2017041542
Publication Number 2018/013571
Status In Force
Filing Date 2017-07-11
Publication Date 2018-01-18
Owner
  • KNOWLES ELECTRONICS, LLC (USA)
  • AMS AG (Austria)
Inventor
  • Albers, John J.
  • Froehlich, Thomas

Abstract

An integrated circuit includes a first amplifier and a second amplifier. A first impedance matching circuit is coupled to the first amplifier, a first charge pump, and a single MEMS transducer. A second impedance matching circuit is coupled to the second amplifier, a second charge pump, and to the single MEMS transducer. A first capacitive load as measured at an input of first amplifier, and a second capacitive load as measured at an input of the second amplifier exist. The first capacitive load and the second capacitive load are balanced with respect to each other. A single pressure change causes the single MEMS transducer to create a first electrical signal and a second electrical signal. Both the first electrical signal and the second electrical signal are matched or approximately matched in magnitude, and 180 degrees or approximately 180 degrees out of phase with respect to each other.

IPC Classes  ?

86.

MICROPHONE ASSEMBLY WITH DIGITAL FEEDBACK LOOP

      
Application Number US2017036855
Publication Number 2018/009306
Status In Force
Filing Date 2017-06-09
Publication Date 2018-01-11
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Shajaan, Mohammad
  • Fürst, Claus, Erdmann
  • Høvesten, Per, Flemming
  • Berthelsen, Kim, Spetzler
  • Thomsen, Henrik

Abstract

A microphone assembly includes a transducer element and a processing circuit. The processing circuit includes an analog-to-digital converter (ADC) configured to receive, sample and quantize a microphone signal generated by the transducer element to generate a corresponding digital microphone signal. The processing circuit includes a feedback path including a digital loop filter configured to receive and filter the digital microphone signal to provide a first digital feedback signal and a digital-to-analog converter (DAC) configured to convert the first digital feedback signal into a corresponding analog feedback signal. The processing circuit additionally includes a summing node at the transducer output configured to combine the microphone signal and the analog feedback signal.

IPC Classes  ?

  • H04R 3/04 - Circuits for transducers for correcting frequency response
  • H03M 1/12 - Analogue/digital converters
  • H03G 5/16 - Automatic control
  • H03F 3/181 - Low-frequency amplifiers, e.g. audio preamplifiers
  • H03M 3/00 - Conversion of analogue values to or from differential modulation

87.

TRANSDUCER PACKAGE WITH THROUGH-VIAS

      
Application Number US2017037282
Publication Number 2018/009308
Status In Force
Filing Date 2017-06-13
Publication Date 2018-01-11
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor Loeppert, Pete

Abstract

A microphone includes a microelectromechanical system (MEMS) die configured to sense an acoustic signal, a base, and a lid. The base has a top surface and a bottom surface. The bottom surface includes a first electrical pad and a second electrical pad. The first electrical pad and the second electrical pad are configured to transmit an electrical signal indicative of the acoustic signal. The lid has a top surface and a bottom surface. The lid includes a cavity that surrounds the MEMS die. The top surface of the lid includes a third electrical pad and a fourth electrical pad. The first electrical pad and the third electrical pad are electrically connected, and the second electrical pad and the fourth electrical pad are electrically connected.

IPC Classes  ?

  • H04R 19/00 - Electrostatic transducers
  • H04R 19/04 - Microphones
  • H04R 31/00 - Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor

88.

MICROPHONE WITH INTEGRATED GAS SENSOR

      
Application Number US2017036771
Publication Number 2017/222832
Status In Force
Filing Date 2017-06-09
Publication Date 2017-12-28
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Chandrasekaran, Venkataraman
  • Szczech, John
  • Watson, Josh
  • Furst, Claus

Abstract

Systems and apparatuses for a microelectromechanical system (MEMS) device. The MEMS device includes a housing, a transducer, and a sensor. The housing includes a substrate defining a port and a cover. The substrate and the cover cooperatively form an internal cavity. The port fluidly couples the internal cavity to an external environment. The transducer is disposed within the internal cavity and positioned to receive acoustic energy through the port. The transducer is configured to convert the acoustic energy into an electrical signal. The sensor is disposed within the internal cavity and positioned to receive a gas through the port. The sensor is configured to facilitate detecting at least one of an offensive odor, smoke, a volatile organic compound, carbon monoxide, carbon dioxide, a nitrogen oxide, methane, and ozone.

IPC Classes  ?

  • B81B 7/02 - Microstructural systems containing distinct electrical or optical devices of particular relevance for their function, e.g. microelectro-mechanical systems (MEMS)
  • B81B 5/00 - Devices comprising elements which are movable in relation to each other, e.g. comprising slidable or rotatable elements

89.

METHOD FOR PROTECTING BOND PADS FROM CORROSION AND CORRESPONDING DEVICE

      
Application Number US2017034793
Publication Number 2017/210131
Status In Force
Filing Date 2017-05-26
Publication Date 2017-12-07
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Loeppert, Peter V.
  • Pedersen, Michael

Abstract

The method includes providing a wafer having a plurality of circuits, each of the plurality of circuits having a plurality of bond pads including a first metal; applying a coating (170) onto at least the plurality of bond pads (160); etching a hole (172) in the coating (170) on each of the plurality of bond pads (160) to provide an exposed portion of the plurality of bond pads (160); dicing the wafer to separate each of the plurality of circuits; die bonding each of the plurality of circuits to a respective packaging substrate; and performing a bonding process to bond a second, dissimilar metal (150) to the exposed portion of each of the plurality of bond pads (160) such that the second, dissimilar metal (150) encloses the hole (172) in the coating (170) of each of the plurality of bond pads (160), thereby enclosing the exposed portion.

IPC Classes  ?

  • H01L 21/60 - Attaching leads or other conductive members, to be used for carrying current to or from the device in operation
  • H01L 23/485 - Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads or terminal arrangements consisting of lead-in layers inseparably applied to the semiconductor body consisting of layered constructions comprising conductive layers and insulating layers, e.g. planar contacts
  • H01L 23/49 - Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads or terminal arrangements consisting of soldered or bonded constructions wire-like
  • B81B 7/00 - Microstructural systems
  • B81C 1/00 - Manufacture or treatment of devices or systems in or on a substrate

90.

MICROPHONE DEVICE WITH INTEGRATED PRESSURE SENSOR

      
Application Number US2017034317
Publication Number 2017/205533
Status In Force
Filing Date 2017-05-24
Publication Date 2017-11-30
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Chandrasekaran, Venkataraman
  • Furst, Claus
  • Watson, Joshua
  • Szczech, John

Abstract

A microphone device comprises a microphone die including a first microphone motor and a second microphone motor, an acoustic integrated circuit structured to process signals produced by the first microphone motor and the second microphone motor, and a sensor die stacked on top of the acoustic integrated circuit, wherein the sensor die comprises a pressure sensor. Another microphone comprises a microphone die including a first microphone motor and a second microphone motor and an integrated circuit die. The integrated circuit die comprises an acoustic integrated circuit structured to process signals produced by the first microphone motor and the second microphone motor, a pressure sensor, and a pressure integrated circuit structured to press signals produced by the pressure sensor.

IPC Classes  ?

  • H04R 19/00 - Electrostatic transducers
  • H04R 19/04 - Microphones
  • B81B 7/00 - Microstructural systems
  • B81B 7/02 - Microstructural systems containing distinct electrical or optical devices of particular relevance for their function, e.g. microelectro-mechanical systems (MEMS)
  • G01L 23/12 - Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid operated electrically by changing capacitance or inductance
  • H04R 1/04 - Structural association of microphone with electric circuitry therefor
  • H04R 3/00 - Circuits for transducers
  • B81C 1/00 - Manufacture or treatment of devices or systems in or on a substrate
  • G01L 27/00 - Testing or calibrating of apparatus for measuring fluid pressure

91.

STEREO SEPARATION AND DIRECTIONAL SUPPRESSION WITH OMNI-DIRECTIONAL MICROPHONES

      
Application Number US2017030220
Publication Number 2017/192398
Status In Force
Filing Date 2017-04-28
Publication Date 2017-11-09
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Roy, Jonathon
  • Woodruff, John
  • Sakri, Shailesh
  • Verma, Tony

Abstract

Systems and methods for stereo separation and directional suppression are provided. An example method includes receiving a first audio signal, representing sound captured by a first microphone (106a) associated with a first location, and a second audio signal, representing sound captured by a second microphone (106b) associated with a second location. The microphones comprise omni-directional microphones. The distance between the first and second microphones is limited by the size of a mobile device (104). A first channel signal of a stereo signal is generated by forming, based on the first and second audio signals, a first beam at the first location. A second channel signal of the stereo signal is generated by forming, based on the first and second audio signals, a second beam at the second location. First and second directions, associated respectively with the first and second beams, are fixed relative to a line between the first and second locations.

IPC Classes  ?

92.

LOW-COST MINIATURE MEMS VIBRATION SENSOR

      
Application Number US2017018009
Publication Number 2017/142975
Status In Force
Filing Date 2017-02-15
Publication Date 2017-08-24
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Volk, Martin
  • Qutub, Sarmad

Abstract

A vibrational sensor comprises a microelectromechanical (MEMS) microphone having a base and a lid defining an enclosure, a MEMS acoustic pressure sensor within the enclosure, and a port defining an opening through the enclosure and material that is arranged to plug the port of the MEMS microphone. In embodiments, the MEMS microphone further includes an integrated circuit within the enclosure that is electrically connected to the MEMS acoustic pressure sensor. In some embodiments, the integrated circuit is configured to bias and buffer the MEMS acoustic pressure sensor. In these and other embodiments, the integrated circuit includes circuitry for conditioning and processing electrical signals generated by the MEMS acoustic pressure sensor. In embodiments, the material is arranged with respect to the port so as to cause the MEMS acoustical pressure sensor to sense vibrational energy rather than acoustic energy as in a conventional MEMS microphone.

IPC Classes  ?

  • H04R 1/04 - Structural association of microphone with electric circuitry therefor
  • H04R 1/02 - Casings; Cabinets; Mountings therein
  • B81B 7/00 - Microstructural systems

93.

SYSTEM AND METHOD FOR DETECTING TOUCH ON A SURFACE OF A TOUCH SENSITIVE DEVICE

      
Application Number US2017018011
Publication Number 2017/142976
Status In Force
Filing Date 2017-02-15
Publication Date 2017-08-24
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Qutub, Sarmad
  • Volk, Martin
  • Ali, Asad
  • Cradock, Stephen
  • Dektor, Shandor
  • Hamel, Max

Abstract

A touch sensitive device including a front panel having a touch surface and a back surface opposite the touch surface. The touch sensitive device further includes one or more vibration transducers mounted to the back surface, and a controller electronically connected to the vibration transducer. The controller receives, from the vibration transducer, a vibration signal, extracts feature information corresponding to predetermined features from the vibration signal, determines, based on the feature information, that a touch occurred within a predefined area of the touch surface, and outputs a signal indicating that the touch occurred within the predefined area of the touch surface.

IPC Classes  ?

  • G06F 3/043 - Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using propagating acoustic waves

94.

ULTRASONIC ACTUATOR APPARATUS

      
Application Number US2017018225
Publication Number 2017/143099
Status In Force
Filing Date 2017-02-16
Publication Date 2017-08-24
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Qutub, Sarmad
  • Volk, Martin

Abstract

An ultrasonic actuation apparatus includes a piezoelectric transducer producing a first ultrasonic signal; a second transducer; and a platen, the platen being directly and/or acoustically coupled to the piezoelectric transducer and the second transducer. The second transducer may be a MEMS microphone. The second transducer is configured to receive the first ultrasonic signal at a first time, and a second ultrasonic signal at second time. The second ultrasonic signal has been modified from the first ultrasonic signal in correspondence with an object being in contact with the platen.

IPC Classes  ?

  • G06F 3/043 - Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using propagating acoustic waves

95.

MICROPHONE MEMORY

      
Application Number US2017018353
Publication Number 2017/143177
Status In Force
Filing Date 2017-02-17
Publication Date 2017-08-24
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Folsom, George
  • Pawlowski, Andrzej

Abstract

Microphone assemblies, acoustic signal processing circuits, and related methods are provided. One method is implemented in a microphone assembly including a MEMS transducer and processing circuitry disposed in a housing formed by a cover and a base with a conductive pad. The processing circuitry includes memory storing microphone characterization information. The method includes receiving, via the conductive pad of the microphone assembly, a request for the microphone characterization information stored in the memory and transmitting, from the microphone assembly, the microphone characterization information via the conductive pad in response to the request. The microphone characterization information is indicative of a frequency response characteristic of the microphone assembly.

IPC Classes  ?

  • G11C 16/10 - Programming or data input circuits
  • H04R 1/04 - Structural association of microphone with electric circuitry therefor
  • H04R 1/08 - Mouthpieces; Attachments therefor
  • H04R 1/20 - Arrangements for obtaining desired frequency or directional characteristics
  • H04R 1/22 - Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
  • H04R 3/02 - Circuits for transducers for preventing acoustic reaction
  • H04R 3/04 - Circuits for transducers for correcting frequency response
  • H04R 3/08 - Circuits for transducers for correcting frequency response of electromagnetic transducers

96.

DIFFERENTIAL MEMS MICROPHONE

      
Application Number US2017016564
Publication Number 2017/136763
Status In Force
Filing Date 2017-02-03
Publication Date 2017-08-10
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Kuntzman, Michael
  • Conklin, Wade
  • Lee, Sung Bok

Abstract

The present disclosure relates generally to microphones and related components. One example micro electro mechanical system (MEMS) motor includes a first diaphragm; a second diaphragm that is disposed in generally parallel relation to the first diaphragm, the first diaphragm and second diaphragm forming an air gap there between; and a back plate disposed in the air gap between and disposed in generally parallel relation to the first diaphragm and the second diaphragm.

IPC Classes  ?

  • H04R 19/00 - Electrostatic transducers
  • H04R 19/04 - Microphones
  • H04R 1/04 - Structural association of microphone with electric circuitry therefor
  • B81B 3/00 - Devices comprising flexible or deformable elements, e.g. comprising elastic tongues or membranes

97.

APPARATUS TO BIAS MEMS MOTORS

      
Application Number US2017015895
Publication Number 2017/136364
Status In Force
Filing Date 2017-01-31
Publication Date 2017-08-10
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Conklin, Wade
  • Kuntzman, Michael
  • Lee, Sung Bok

Abstract

A microphone includes a first micro electro mechanical system (MEMS) motor (202), the first MEMS motor (202) including a first diaphragm (204) and a first back plate (206); and a second MEMS motor (222) including a second diaphragm (224) and a second back plate (226). The first diaphragm (204) is electrically biased relative to the first back plate (206) according to a first voltage, the second diaphragm (224) is biased relative to the second back plate (226) according to a second voltage, and the magnitude of the first voltage is different from the magnitude of the second voltage.

IPC Classes  ?

  • H04R 1/24 - Structural combinations of separate transducers or of parts of the same transducer and responsive respectively to two or more frequency ranges
  • H04R 3/06 - Circuits for transducers for correcting frequency response of electrostatic transducers
  • H04R 19/04 - Microphones

98.

MICROPHONE AND PRESSURE SENSOR

      
Application Number US2017016537
Publication Number 2017/136744
Status In Force
Filing Date 2017-02-03
Publication Date 2017-08-10
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Kuntzman, Michael
  • Conklin, Wade
  • Lee, Sung Bok

Abstract

The present disclosure generally relates to acoustic assemblies. One acoustic assembly includes a base and a first die disposed on the base. The first die comprises a microelectromechanical system (MEMS) microphone that includes a first diaphragm and a first back plate. The MEMS microphone has a barometric release. The acoustic assembly also includes a second die disposed on the base. The second die comprises a pressure sensor. The acoustic assembly further includes a cover coupled to the base and enclosing the first dies and the second die. A back volume is formed between the base, the first die, the second die, and the cover. The pressure sensor is configured to sense a pressure of the back volume.

IPC Classes  ?

99.

METHODS AND SYSTEMS FOR PROVIDING CONSISTENCY IN NOISE REDUCTION DURING SPEECH AND NON-SPEECH PERIODS

      
Application Number US2016069094
Publication Number 2017/131921
Status In Force
Filing Date 2016-12-29
Publication Date 2017-08-03
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor Yen, Kuan-Chieh

Abstract

Methods and systems for providing consistency in noise reduction during speech and non-speech periods are provided. First and second signals are received. The first signal includes at least a voice component. The second signal includes at least the voice component modified by human tissue of a user. First and second weights may be assigned per subband to the first and second signals, respectively. The first and second signals are processed to obtain respective first and second full-band power estimates. During periods when the user's speech is not present, the first weight and the second weight are adjusted based at least partially on the first full-band power estimate and the second full-band power estimate. The first and second signals are blended based on the adjusted weights to generate an enhanced voice signal. The second signal may be aligned with the first signal prior to the blending.

IPC Classes  ?

  • G10L 21/02 - Speech enhancement, e.g. noise reduction or echo cancellation
  • H04R 3/00 - Circuits for transducers
  • G10L 21/0232 - Processing in the frequency domain

100.

EARBUD CONTROL USING PROXIMITY DETECTION

      
Application Number US2016069097
Publication Number 2017/131922
Status In Force
Filing Date 2016-12-29
Publication Date 2017-08-03
Owner KNOWLES ELECTRONICS, LLC (USA)
Inventor
  • Gadonniex, Sharon
  • Qutub, Sarmad
  • Ryan, William

Abstract

Systems and methods for earbud control based on proximity detection are provided. An example method includes transmitting ultrasonic signals and receiving reflected ultrasonic signals. Based at least partially on the reflected ultrasonic signals, a distance of an earbud to an ear canal may be determined. If the distance is above a first predetermined threshold value, a low-power mode is activated. If the distance is below the first predetermined threshold value, a functionality of the earbud is modified. Modifying the functionality of the earbud may include activating a full power mode and may further include determining a quality of a seal, provided by the earbud, in the ear canal. If the quality of the seal is above a second predetermined threshold value, a positive feedback is provided to a user. If the quality of the seal is below the second predetermined threshold value, a negative feedback is provided to the user.

IPC Classes  ?

  • H04R 1/10 - Earpieces; Attachments therefor
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