Generally disclosed herein is a system and method for correcting an audio spatial image within a vehicle. The gain and the delay of sound sources, such as speakers within a vehicle, are adjusted such that the sound sources arrive at a listener simultaneously and with the same amplitude. Symmetric output channel pairs may be identified from the sound sources, and power spectrum differences between the symmetric output channel pairs may be computed. A power spectrum equalization transfer function may be obtained and applied to each output channel pair. A center image of the sound sources may be detected, and the center image of the sound sources may be adjusted by applying additional amplitude or phase panning such that the center image may be placed in a desired position.
Generally disclosed herein is a mechanism to increase the perceived sound field width and depth in an automotive environment without causing excessive or unnatural reverberation. The audio ambiance may be added using a cross-analysis of a vehicle cabin and a typical room's sound decay characteristics. The late reverb insertion and extraction time may be determined from the target room response and the vehicle cabin response, and the late reverberation transfer function may be computed. Once the late reverberation transfer function is obtained, the combined cabin transfer function can be measured, and a scale factor for energy equalization derived. The total energy of the sound within the vehicle cabin may be normalized and the reverberation frequency spectrum may be equalized such that the late reverberation within the vehicle cabin is synthesized with the desired energy decay of the late reverberation of the sound in a room.
Described herein are various embodiments of a system and method for varying the modulation intensity by scaling the constellation points of hierarchically modulated advanced FM service modes in HD Radio transmission systems. These embodiments include the novel ability to adjust the performance of the base layer of a hierarchically modulated signal relative to the overlay layer of the hierarchically modulated signal.
H04H 20/30 - Arrangements for simultaneous broadcast of plural pieces of information by a single channel
H04H 60/07 - Arrangements for generating broadcast information; Arrangements for generating broadcast-related information with a direct linkage to broadcast information or to broadcast space-time; Arrangements for simultaneous generation of broadcast information and broadcast-related information characterised by processes or methods for the generation
Embodiments of a method and detector for providing an alert message at a unit of a digital radio broadcast system is provided. The method comprises providing a multichannel audio stream comprising a first audio channel and a second audio channel, analyzing the first audio channel and the second audio channel regarding phase inversion of the channels, and creating the alert message if the first audio channel is phase inverted with respect to the second audio channel.
H04H 20/47 - Arrangements characterised by circuits or components specially adapted for broadcast specially adapted for broadcast systems covered by groups specially adapted for stereophonic broadcast systems
G10L 19/008 - Multichannel audio signal coding or decoding using interchannel correlation to reduce redundancy, e.g. joint-stereo, intensity-coding or matrixing
H04H 60/07 - Arrangements for generating broadcast information; Arrangements for generating broadcast-related information with a direct linkage to broadcast information or to broadcast space-time; Arrangements for simultaneous generation of broadcast information and broadcast-related information characterised by processes or methods for the generation
H04H 20/12 - Arrangements for monitoring, testing or troubleshooting
5.
METHOD AND SYSTEM FOR SYNCHRONIZING AUDIO TRANSMISSION IN A SINGLE FREQUENCY NETWORK
Methods and systems for synchronizing audio transmission in a single frequency network. Aspects of a method include preparing in a first exporter a first digital audio signal for transmission to a first exciter engine; buffering the first digital audio signal and transmitting the buffered first digital audio signal to the first exciter engine; preparing in a second exporter a second digital audio signal for transmission to a second exciter engine; buffering the second digital audio signal; transmitting the first digital audio signal from the first control unit to the second control unit; receiving control commands regarding a buffered first or second digital audio signal, wherein the second control unit transmits the buffered first or second digital audio signal dependent on the received control commands; and synchronized transmission of the buffered first digital audio signal and the buffered first or second digital audio signal based on a received trigger signal.
Embodiments of a method and system for transmitting an audio stream and a digital radio broadcasting system are disclosed. The method comprises providing an audio source remotely located to a digital radio broadcasting system, encoding at the audio source an audio stream with an audio codec resulting in an encoded audio stream, transmitting the encoded audio stream over a computer network to the digital radio broadcasting system, receiving the encoded audio stream and processing the encoded audio stream at the digital radio broadcasting system for broadcast by the digital radio broadcasting system without decoding of the encoded audio stream, and broadcasting the encoded audio stream by the digital radio broadcasting system.
H04H 60/07 - Arrangements for generating broadcast information; Arrangements for generating broadcast-related information with a direct linkage to broadcast information or to broadcast space-time; Arrangements for simultaneous generation of broadcast information and broadcast-related information characterised by processes or methods for the generation
7.
METHOD FOR TIME ALIGNING IN-BAND ON-CHANNEL DIGITAL RADIO AUDIO WITH FM RADIO AUDIO
A method comprises: receiving a first audio stream that conveys audio content and a second audio stream that conveys the audio content and is delayed relative to the first audio stream by a time delay; one-sided filtering first audio segments of the first audio stream to pass only positive frequencies of the first audio segments to first filtered audio segments; one-sided filtering second audio segments of the second audio stream to pass only positive frequencies of the second audio segments to second filtered audio segments; cross correlating the first filtered audio segments against corresponding ones of the second filtered audio segments, to produce cross-correlation results; detecting a peak indicated by the cross- correlation results; and estimating the time delay based on a position of the peak, to produce an estimated time delay.
H04H 60/07 - Arrangements for generating broadcast information; Arrangements for generating broadcast-related information with a direct linkage to broadcast information or to broadcast space-time; Arrangements for simultaneous generation of broadcast information and broadcast-related information characterised by processes or methods for the generation
H04H 20/12 - Arrangements for monitoring, testing or troubleshooting
H04H 20/22 - Arrangements for broadcast of identical information via plural broadcast systems
8.
QUANTIZED TRANSPORT FOR IMPORTER-EXPORTER AUDIO CLIENT IN DIGITAL RADIO BROADCAST
A method comprising: at an importer of an IBOC digital radio broadcasting system: establishing a data link to an audio client configured to buffer audio from an audio source over a buffering duration, to produce buffered audio; receiving, from the audio client, an indication of the buffering duration; identifying a logical channel of an IBOC waveform assigned to the audio client and configured to transmit PDUs of the audio at a PDU rate; computing a quantized number of PDUs that is greater than one into which the buffered audio is to be divided at the audio client based on the buffering duration and the PDU rate; sending, to the audio client, an indication of the quantized number of the PDUs; and upon sending importer data requests to the audio client over the data link, receiving, from the audio client, client data responses each including the quantized number of the PDUs.
H04H 60/07 - Arrangements for generating broadcast information; Arrangements for generating broadcast-related information with a direct linkage to broadcast information or to broadcast space-time; Arrangements for simultaneous generation of broadcast information and broadcast-related information characterised by processes or methods for the generation
Embodiments of a method for rendering an alert message at a user device and of an emergency alert location filtering system are disclosed. In an embodiment the method comprises determining a current geographical location of the user device, receiving alert messages, each alert message comprising message information and a geographical code, and configuring an alert filter at the user device to allow alert messages to pass the alert filter for rendering at the user device that comprise a geographical code which corresponds to a geographical area in which the current geographical location of the user device is located.
A method performed by a radio receiver comprises: receiving digital radio broadcast (DRB) signals on respective frequency channels; acquiring a list that identifies which of the DRB signals are all-digital signals; receiving a tune command to tune to a particular DRB signal among the DRB signals; and upon determining that the particular DRB signal is an all-digital signal based on the list: playing muted audio; while playing muted audio, tuning to the particular DRB signal based on the tune command and performing digital signal acquisition of the particular DRB signal; and when the digital signal acquisition is complete, performing digital demodulation of the particular DRB signal to recover digital audio, and switching from playing muted audio to playing digital audio.
A method comprises performing iterations of a peak-to-average ratio (PAR) reduction algorithm on a modulated OFDM symbol, each of the iterations including: clipping the modulated OFDM symbol to produce a clipped modulated OFDM symbol; subtracting the clipped modulated OFDM symbol from the modulated OFDM symbol to produce a difference signal; weighting the difference signal using a weight that varies across the iterations, to produce a weighted difference signal that varies across the iterations; subtracting the weighted difference signal from the modulated OFDM symbol to produce a modified modulated OFDM symbol; and performing further PAR reduction operations on the modified modulated OFDM symbol to produce a PAR- reduced OFDM symbol for use in a next iteration.
A method comprises partitioning a data object into a sequence of nested data objects each including fragments having K symbols per fragment. The method further comprises processing the nested data objects to produce sequences of coded payloads corresponding to the nested data objects. The processing includes, for each nested data object: using (n, K) coding for which n>K, individually coding the fragments of the nested data object into codewords with n codeword symbols per codeword; and generating, from the codewords, a sequence of coded payloads that are unique for the nested data object. The method further comprises transmitting coded payloads of the sequences of coded payloads.
A method comprises, at a hybrid radio receiver configured to recover audio content separately from a broadcast radio signal and from a wireless network connection, receiving a reception metric that indicates audio quality of the audio content in the broadcast radio signal at any given time. The method further comprises, deriving, from fluctuations of the reception metric over time, fluctuation indicators that indicate audio quality fluctuations that are likely noticeable to a listener. The method further comprises deriving a switching decision to use the broadcast radio signal or the wireless network connection as a source of the audio content based on a previous switching decision and the fluctuation indicators to introduce hysteresis into the switching decision, and selecting the broadcast radio signal or the wireless network connection as the source of the audio content based on the switching decision.
H04N 21/462 - Content or additional data management e.g. creating a master electronic program guide from data received from the Internet and a Head-end or controlling the complexity of a video stream by scaling the resolution or bit-rate based on the client capabi
H04W 4/06 - Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
14.
PROVIDING EMERGENCY ALERTS TO CONNECTED RADIO RECEIVERS
An audio delivery system (100) can include an alert processor (108) configured to parse alert content. The alert processor can receive first data representing the alert content. The alert processor can convert the alert content to an alert message that includes alert text and parameters. A connected radio server (120), coupled to the alert processor via internet protocol, can insert the alert content into a data stream. The connected radio server can receive second data representing the alert message from the alert processor via internet protocol. The connected radio server can receive instructions from the alert processor via internet protocol to incorporate the alert message into the data stream. The data stream can include an audio stream and the alert message. The connected radio server can provide the data stream to a connected radio receiver (102) via internet protocol.
A radio receiver comprises radio frequency (RF) receiver circuitry that receives a radio broadcast signal, an Internet network interface, a display, a memory, processing circuitry, and a client application including instructions for execution by the processing circuitry. The client application is configured to: determine geographic location information of the radio receiver; determine radio broadcasts that are available to the radio receiver using the geographical location information; select metadata, from metadata stored in the memory, that is associated with the radio broadcasts available to the radio receiver; and present information included in the selected metadata using the display according to the received radio broadcast signal.
H04H 60/85 - Arrangements characterised by transmission systems other than for broadcast, e.g. the Internet characterised by the transmission system itself the transmission system being the Internet accessed over telephonic networks which are mobile communication networks
H04H 60/73 - Systems specially adapted for using specific information, e.g. geographical or meteorological information using meta-information
H04H 60/51 - Arrangements for identifying or recognising characteristics with a direct linkage to broadcast information or to broadcast space-time, e.g. for identifying broadcast stations or for identifying users for identifying locations of receiving stations
A system comprises an intermediate communication platform that provides an interface to an Internet network; and a first server including: a port operatively coupled to the intermediate communication platform, processing circuitry, and a service application for execution by the processor. The service application is configured to: receive geographic location information of a radio receiver via the intermediate communication platform; determine one or more radio broadcasts available to the radio receiver according to the geographic location information; and send metadata for the radio broadcast, the metadata including an indication whether content of the radio broadcast is suitable for an audio fingerprinting process to the radio receiver via the intermediate communication platform.
H04H 60/41 - Arrangements for identifying or recognising characteristics with a direct linkage to broadcast information or to broadcast space-time, e.g. for identifying broadcast stations or for identifying users for identifying broadcast time or space for identifying broadcast space, i.e. broadcast channels, broadcast stations or broadcast areas
H04H 60/51 - Arrangements for identifying or recognising characteristics with a direct linkage to broadcast information or to broadcast space-time, e.g. for identifying broadcast stations or for identifying users for identifying locations of receiving stations
H04H 60/73 - Systems specially adapted for using specific information, e.g. geographical or meteorological information using meta-information
H04H 60/82 - Arrangements characterised by transmission systems other than for broadcast, e.g. the Internet characterised by the transmission system itself the transmission system being the Internet
17.
SYSTEM FOR SCANNING DIGITAL BROADCAST RADIO CONTENT
A radio broadcast signal receiver comprises tuner circuitry configured to receive a radio broadcast signal including digital audio content and processing circuitry. The processing circuitry is configured to: scan for radio broadcast signals by tuning the tuner circuitry to multiple radio broadcast signal frequencies and vary a time duration that the tuner circuitry is tuned to the radio broadcast signal frequencies during the scanning according to when digital audio content of the radio broadcast signals becomes available for play by the radio broadcast signal receiver.
H04H 60/41 - Arrangements for identifying or recognising characteristics with a direct linkage to broadcast information or to broadcast space-time, e.g. for identifying broadcast stations or for identifying users for identifying broadcast time or space for identifying broadcast space, i.e. broadcast channels, broadcast stations or broadcast areas
H04H 20/26 - Arrangements for switching distribution systems
A method comprises generating for a Global Navigation Satellite System (GNSS) a differential correction map (DCM) representing a non-planar surface of differential corrections that varies across a geographical area represented by the DCM, the differential corrections being based on a reference station constellation of GNSS reference stations having respective locations spanning the geographical area, the GNSS reference stations including physical or virtual reference stations.
G01S 19/07 - Cooperating elements; Interaction or communication between different cooperating elements or between cooperating elements and receivers providing data for correcting measured positioning data, e.g. DGPS [differential GPS] or ionosphere corrections
G01S 5/00 - Position-fixing by co-ordinating two or more direction or position-line determinations; Position-fixing by co-ordinating two or more distance determinations
G01S 19/00 - Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
G01S 19/41 - Differential correction, e.g. DGPS [differential GPS]
A method comprises receiving an approximate location of a rover platform based on satellite signals for a Global Navigation Satellite System (GNSS), and receiving for the GNSS a differential correction map (DCM) representing a non-planar surface of differential corrections that varies across a geographical area represented by the DCM. The differential corrections are based on a reference station constellation of GNSS reference stations having respective locations spanning the geographical area. The method further comprises deriving DCM-based differential corrections for the satellite signals at the approximate location based on the DCM, correcting the satellite signals using the DCM-based differential corrections, and determining a location of the rover platform using the corrected satellite signals.
G01S 19/07 - Cooperating elements; Interaction or communication between different cooperating elements or between cooperating elements and receivers providing data for correcting measured positioning data, e.g. DGPS [differential GPS] or ionosphere corrections
G01S 5/00 - Position-fixing by co-ordinating two or more direction or position-line determinations; Position-fixing by co-ordinating two or more distance determinations
G01S 19/00 - Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
G01S 19/41 - Differential correction, e.g. DGPS [differential GPS]
20.
LOWER-UPPER-MAIN-BACKUP (LUMB) SERVICE MODES FOR RADIO BROADCASTS
A radio transmitter comprises transmitting circuitry and processing circuitry. The transmitting circuitry broadcasts a frequency modulation (FM) in-band on-channel (IBOC) radio signal, wherein the FM IBOC radio signal includes multiple subcarriers grouped into multiple frequency partitions. The processing circuitry is configured to receive input bits for transmitting; encode and puncture the input bits using forward error correction (FEC) encoding; distribute encoded input bits between a main encoded component and a backup encoded component, wherein encoded bits of the backup encoded component are delayed for a specified duration relative to encoded bits of the main encoded component; allocate the encoded input bits of the main and backup encoded components into frequency diverse sidebands of the FM IBOC radio signal; and modulate the encoded input bits for transmitting using the frequency diverse sidebands of the FM IBOC radio signal, wherein the modulation is a type of quadrature amplitude modulation (QAM).
A system comprises an intermediate communication platform that provides an interface to an Internet network; and a first server including: a port operatively coupled to the intermediate communication platform, processing circuitry, and a service application for execution by the processor. The service application is configured to: receive audio content recognition information from a first radio receiver of multiple radio receivers via the intermediate communication platform, wherein the audio content recognition information identifies audio content received by the first receiver in a radio broadcast; determine audio metadata associated with the received audio content recognition information; and send the audio metadata to the multiple radio receivers via the intermediate communication platform.
G06F 17/30 - Information retrieval; Database structures therefor
H04H 60/74 - Systems specially adapted for using specific information, e.g. geographical or meteorological information using meta-information using programme related information, e.g. title, composer or interpreter
H04L 29/06 - Communication control; Communication processing characterised by a protocol
22.
ESTIMATING DIGITAL AUDIO AVAILABILITY IN RADIO BROADCAST
A radio signal processing circuit comprises multiple audio blend channels, an audio decoder, a program selector and a blending circuit. The audio blend channels are configured to receive digital audio packets for multiple supplemental audio programs. Each audio blend channel includes an audio blend buffer and a signal quality metric circuit. The signal quality metric (SQM) circuit configured to determines an audio quality indicator for the digital audio packets of the program and indicates availability of the program according to the audio quality indicator regardless of whether the program is selected for play. The program selector configured to provides digital audio packets from a selected audio blend channel to the audio decoder to produce a digital audio signal. The blending circuit blends the digital audio signal produced for the selected audio blend channel with a signal representing silence according to the audio quality indicator for the audio blend channel.
G10L 19/00 - 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
A radio receiver comprises physical layer circuitry and processor circuitry. The physical layer circuitry receives quadrature amplitude modulation (QAM) symbols via a plurality of subcarriers included in a broadcast radio signal. Each received QAM symbol is a complex symbol comprising multiple bits of encoded source information. The processing circuitry demodulates the received data symbols, generates a constellation sample for each received QAM symbol, generates a soft metric for each bit of encoded information of the received QAM symbols using the constellation sample, and multiplies the soft metric by a channel state information (CSI) weight to produce a Log-likelihood Ratio (LLR) approximation for each bit of encoded information of the received QAM symbols.
Service modes specify how digital content is formatted in sidebands of an FM radio channel. In an improved service mode, encoded bits can be distributed between an in-band encoded component and a cross-band encoded component, where the encoded bits in the in-band encoded component are desynchronized by a specified duration with respect to the encoded bits in the cross-band encoded component. The encoded bits in the in-band encoded component can be allocated into frequency partitions that are used by a legacy service mode, such as MP1 or MP3, which can provide backward compatibility with the legacy service mode. The encoded bits in the cross-band encoded component can be allocated into frequency partitions that are not used by the legacy service mode, and are found in the opposite sideband, compared with the legacy service mode, which can provide time diversity within a single sideband.
H04H 20/31 - Arrangements for simultaneous broadcast of plural pieces of information by a single channel using in-band signals, e.g. subsonic or cue signal
H04H 20/95 - Arrangements characterised by special technical features of the broadcast information, e.g. signal form or information format characterised by a specific format, e.g. MP3 [MPEG-1 Audio Layer 3]
H04L 1/00 - Arrangements for detecting or preventing errors in the information received
Systems and methods to process a digital audio broadcast signal having a plurality of digital audio signals can be implemented in a variety of applications. The digital audio broadcast signal having a main program service and a set of supplemental program services can be received at a digital audio system and processed to provide an audio signal to a set of speakers. The processing can include calculation of audio levels of audio signals of the main program service and the supplemental program services. One of the services can be selected with the audio signal of the selected service adjusted based on the calculated level of the selected service and a reference signal, prior to sending the audio signal to the set of speakers. In various embodiments, the reference signal can be an analog audio signal in the digital audio broadcast signal. Additional apparatus, systems, and methods are disclosed.
An apparatus comprises a digital input port configured to receive digital audio packets of main program service (MPS) audio; a modem operatively coupled to the digital port; an analog input port configured to receive an audio engineer society format (AES) audio signal that is a digitized version of the analog signal component of the frequency modulation (FM) hybrid radio signal; and an alignment unit configured to time-align the AES audio signal with the digital audio packets at the modem; wherein the modem is configured to generate the FM hybrid radio signal using the digital audio packets and the time-aligned AES audio signal.
A system comprises a first server including a port, a memory, a processor operatively coupled to the port and memory, and a service application for execution by the processor. The service application is configured to: receive identification information related to an over-the-air radio broadcast via the port of the first server, wherein the identification information is transmitted to the first server using a radio broadcast receiver remote from the first server; communicate a request for automatic content recognition (ACR) of an Internet-based streaming version of the over-the-air radio broadcast; and receive metadata associated with the over-the-air radio broadcast in response to the request and initiate transmission of the metadata to the radio broadcast receiver.
G06F 3/00 - Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
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
H04N 5/445 - Receiver circuitry for displaying additional information
A housing can be wearable by a user. At least one microphone in or on the housing can sense ambient audio and produce at least one time-domain audio signal. The housing can be passive, such that the sensed ambient audio does not include any sound emitted from the housing. A transformation circuit can transform the at least one time-domain audio signal to form at least one frequency-domain audio signal. An identification circuit can identify a spectral feature in the at least one frequency-domain audio signal. A tracking circuit can track a time evolution of the spectral feature. A determination circuit can determine from the tracked time evolution of the spectral feature that the spectral feature corresponds to an object moving toward the housing. An alert circuit can alert the user, in response to the determination circuit determining that the object is moving toward the housing.
Tools and techniques are provided for identifying, collecting, and processing music-related content within a radio broadcast environment. In one embodiment, a method is provided for processing music-related broadcast radio data. The method includes receiving a plurality of broadcast radio station signals; identifying each radio station signal as an analog signal or a digitally broadcast signal in response to the identified radio station signals; obtaining a broadcast sample from at least one of the radio stations; identifying at least one music-related information element missing from the broadcast sample; obtaining missing music-related information elements; updating a computer server with the obtained music-related information elements; and generating and communicating a music guide including the updated information to various user devices.
H04H 60/37 - Arrangements for identifying or recognising characteristics with a direct linkage to broadcast information or to broadcast space-time, e.g. for identifying broadcast stations or for identifying users for identifying segments of broadcast information, e.g. scenes or extracting programme ID
H04H 20/12 - Arrangements for monitoring, testing or troubleshooting
H04H 20/57 - Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers for mobile receivers
G06F 17/30 - Information retrieval; Database structures therefor
Over-the-air radio broadcast signals are commonly used to deliver a variety of programming content (e.g., audio, etc.) to radio receiver systems. Supplemental data (e.g., metadata) may be provided to radio broadcast receiver systems, where such supplemental data is associated with the programming content delivered via the over-the-air radio broadcast signals. In exemplary embodiments described herein, a radio receiver system receives both (i) primary programming content via over-the-air radio broadcast transmission, and (ii) metadata related to the programming content via wireless Internet. This use of metadata provides a user with an enhanced experience regardless of the type of terrestrial broadcast signal that is received at the user's radio receiver system. Users receiving radio broadcast signals at a receiver system may view images, videos, multimedia displays, text, etc., that is related to the programming content received via the over-the-air radio broadcast signals.
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
H04H 20/00 - Arrangements for broadcast or for distribution combined with broadcast
H04H 40/90 - Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups specially adapted for satellite broadcast receiving
A method for processing a digital audio broadcast signal in a radio receiver, includes: receiving a hybrid broadcast signal; demodulating the hybrid broadcast signal to produce an analog audio stream and a digital audio stream; and using a normalized cross-correlation of envelopes of the analog audio stream and the digital audio stream to measure a time offset between the analog audio stream and the digital audio stream. The time offset can be used to align the analog audio stream and the digital audio stream for subsequent blending of an output of the radio receiver from the analog audio stream to the digital audio stream or from the digital audio stream to the analog audio stream.
H04H 60/12 - Arrangements for counter-measures when a portion of broadcast information is unavailable wherein another information is substituted for the portion of broadcast information
H04H 20/30 - Arrangements for simultaneous broadcast of plural pieces of information by a single channel
32.
METHOD AND APPARATUS FOR BLENDING AN AUDIO SIGNAL IN AN IN-BAND ON-CHANNEL RADIO SYSTEM
A method for processing a digital audio broadcast signal in a radio receiver includes: receiving a digital audio broadcast signal; demodulating the digital audio broadcast signal to produce an analog audio stream and a digital audio stream; determining a digital signal quality value for the digital audio stream; blending an output of the radio receiver from the analog audio stream to the digital audio stream when the digital signal quality value exceeds an adaptive analog-to-digital threshold value; and blending the output of the radio receiver from the digital audio stream to the analog audio stream when the digital signal quality value falls below an adaptive digital-to-analog threshold value, wherein the adaptive digital-to-analog threshold value is lower than the adaptive analog-to-digital threshold value.
H04H 20/30 - Arrangements for simultaneous broadcast of plural pieces of information by a single channel
H04H 60/11 - Arrangements for counter-measures when a portion of broadcast information is unavailable
H04H 60/12 - Arrangements for counter-measures when a portion of broadcast information is unavailable wherein another information is substituted for the portion of broadcast information
33.
METHOD AND APPARATUS FOR LEVEL CONTROL IN BLENDING AN AUDIO SIGNAL IN AN IN-BAND ON-CHANNEL RADIO SYSTEM
A method for processing a digital audio broadcast signal includes: separating an analog audio portion and a digital audio portion of the digital audio broadcast signal; determining the loudness of the analog audio portion and the digital audio portion over a first short time interval; using the loudness of the analog and digital audio portions to calculate a short term average gain; determining a long term average gain; converting one of the long term average gain or the short term average gain to dB; if an output has been blended to digital, adjusting a digital gain parameter by a preselected increment to produce a digital gain parameter; if an output has not been blended to digital, setting the digital gain parameter to the short term average gain; providing the digital gain parameter to an audio processor; and repeating the above steps using a second short time interval.
H04H 20/22 - Arrangements for broadcast of identical information via plural broadcast systems
H04H 60/12 - Arrangements for counter-measures when a portion of broadcast information is unavailable wherein another information is substituted for the portion of broadcast information
H04H 20/26 - Arrangements for switching distribution systems
34.
METHOD AND APPARATUS FOR AUTOMATIC AUDIO ALIGNMENT IN A HYBRID RADIO SYSTEM
A method of processing a digital radio broadcast signal includes: (a) determining a plurality of current correlation sample values representative of a time delay between samples in an analog audio sample stream and samples in a digital audio sample stream; (b) determining a current inversion status; (c) updating a delay history and an inversion status history; (d) checking the current correlation sample values for consistency with a first confidence threshold; (e) if consistency is found in step (d), determining if each of a first plurality of values in the delay history is consistent within a predetermined range of the current correlation sample values; (f) if consistency is found in step (e), determining if a value in the inversion status history is consistent with the current inversion status; and (g) if the consistency is found in step (f), allowing blending of an output to the digital audio sample stream.
H04H 20/30 - Arrangements for simultaneous broadcast of plural pieces of information by a single channel
H04H 60/12 - Arrangements for counter-measures when a portion of broadcast information is unavailable wherein another information is substituted for the portion of broadcast information
35.
METHOD AND APPARATUS FOR TIME ALIGNMENT OF ANALOG AND DIGITAL PATHWAYS IN A DIGITAL RADIO RECEIVER
A method for processing a radio signal includes producing first and second streams of audio samples; decimating the first and second streams of audio samples to produce first and second streams of decimated streams of audio samples; estimating a first offset value between corresponding samples in the first and second streams of decimated streams of audio samples; shifting one of the first and second streams of audio samples by a first shift value; decimating the first and second streams of audio samples to produce third and fourth streams of decimated audio samples; estimating a second offset value; determining a final offset value based on an intersection of ranges of valid results of the first and second offset values; and shifting one of the first and second streams of audio samples by the final offset value to align the first and second streams of audio samples.
A method of processing a digital radio broadcast signal in a digital radio receiver includes: receiving baseband signal samples at a first sample rate; adjusting the sample rate of the baseband signals based on a difference between a receiver clock and a transmitter clock to produce adjusted baseband signal samples at a second sample rate; filtering the adjusted baseband signal samples to separate a digital component of the samples and an analog component of the samples, wherein the digital component and the analog component are synchronous; and separately demodulating the digital component and the analog component to produce a digital output signal and an analog output signal. A receiver that uses the method is also provided.
Systems, methods, and processor readable media are disclosed for detection of signal quality problems and errors in digital radio broadcast signals. First monitoring equipment is located in an over-the-air coverage area of a first radio station. Second monitoring equipment is located in an over-the-air coverage area of a second radio station. The first and second monitoring equipment are configured to receive digital radio broadcast signals from the respective first and second radio stations. A computing system is configured to receive data from the first monitoring equipment and the second monitoring equipment, the data being indicative of one or more attributes of a digital radio broadcast signal received at respective monitoring equipment. The computing system analyzes received data to detect a signal quality problem or error in the digital radio broadcast signals received at the first and second monitoring equipment.
H04H 20/12 - Arrangements for monitoring, testing or troubleshooting
H04H 60/29 - Arrangements for monitoring broadcast services or broadcast-related services
H04H 60/54 - Arrangements for identifying or recognising characteristics with a direct linkage to broadcast information or to broadcast space-time, e.g. for identifying broadcast stations or for identifying users for identifying locations where broadcast information is generated
38.
METHOD AND APPARATUS FOR ANALOG AND DIGITAL AUDIO BLEND FOR HD RADIO RECEIVERS
A method and apparatus are provided for blending analog and digital portions of a composite digital radio broadcast signal by processing compressed audio packets to compute corresponding digital audio quality indicator values, storing the compressed audio packets in an audio blend buffer, processing audio information from each compressed audio packet stored in the audio blend buffer with an audio decoder to generate decompressed digital audio signal samples, and using the digital audio quality indicator values to guide a blending process for combining analog audio signal samples with the digital audio signal samples to produce an audio output by preventing unnecessary blending back and forth between analog and digital if the digital audio quality indicator values indicate that the compressed audio packets are degraded or impaired.
Enhanced digital broadcast signals are transmitted on a digital radio broadcast signal by allocating spectral resources of the digital radio broadcast signal to simultaneously serve existing receivers (which can decode default content but not new content from the enhanced digital broadcast signal) and new receivers (which can decode default content and can decode new digital content from the enhanced digital broadcast signal) by modulating a first plurality of reference subcarriers with a first signal constellation, and modulating a second plurality of reference subcarriers with a second modified signal constellation such that a receiver processes the digital radio broadcast signal to produce a first coherent reference signal estimate for the first plurality of reference subcarriers to extract the default content for playback and to produce a second coherent reference signal estimate for the second plurality of reference subcarriers to disregard the new content.
H04H 60/07 - Arrangements for generating broadcast information; Arrangements for generating broadcast-related information with a direct linkage to broadcast information or to broadcast space-time; Arrangements for simultaneous generation of broadcast information and broadcast-related information characterised by processes or methods for the generation
40.
SYSTEMS AND METHOD FOR DIGITAL RADIO BROADCAST WITH CROSS PLATFORM RECEPTION
Systems and methods are described for rendering content at a digital radio broadcast receiver system. A digital radio broadcast signal comprises data for rendering content at the digital radio broadcast receiver. The digital radio broadcast signal is processed to determine whether the data from the digital radio broadcast transmission contains a data error. A portion of the data containing the data error is identified. A download request is transmitted to a computing system, where the download request requests duplicate data for the portion of the data containing the data error. The duplicate data is received at the digital radio broadcast receiver for the portion of the data containing the error via other wireless communication other than the digital radio broadcast. The duplicate data is processed to provide an uninterrupted rendering of the content.
A translator includes: an input configured to receive a bit stream having a plurality of digitally encoded contents and control information; processing circuitry configured to select one of the digitally encoded contents, to use the selected digitally encoded content to produce an analog modulated signal, to use the digitally encoded contents to produce a digitally modulated signal, and to combine the analog modulated signal and the digitally modulated signal to produce a hybrid signal; and an output configured to output the hybrid signal. A method performed by the radio signal translator is also provided.
Systems and methods are disclosed for communicating an emergency alert message from a digital radio broadcast transmission system of a mobile vehicle to a digital radio broadcast receiver system. A digital radio broadcast signal including first and second data is broadcasted using the digital radio broadcast transmission system to end-user digital radio broadcast receivers. The first data includes an emergency code, and the second data includes an emergency alert message. The digital radio broadcast signal is transmitted at a predetermined frequency that is recognized by the receivers as an emergency notification frequency. The digital radio broadcast signal can be decoded only by receivers located within a localized area in a proximity of the transmission system. The receivers are configured to automatically tune to the emergency notification frequency to receive the digital radio broadcast signal and render the second data based on a detection of the emergency code within the signal.
G08G 1/0965 - Arrangements for giving variable traffic instructions having an indicator mounted inside the vehicle, e.g. giving voice messages responding to signals from another vehicle, e.g. emergency vehicle
43.
PEAK-TO-AVERAGE POWER RATIO REDUCTION FOR QAM MODULATION WITH HD RADIO SIGNALS
A peak-to-average power reduction method includes: (a) quadrature amplitude modulating a signal including a set of subcarriers with a set of data to produce an OFDM modulated symbol vector; (b) limiting the magnitude of the modulated symbol vector to produce a first limited OFDM modulated symbol; (c) demodulating the first limited OFDM modulated symbol to recover distorted QAM constellations; (d) constraining points in the distorted QAM constellations recovered from the first limited OFDM modulated symbol to produce constrained QAM constellations; (e) modulating an OFDM symbol vector with the constrained QAM constellations to produce a modified modulated OFDM symbol; and (f) output the modified modulated OFDM symbol. A transmitter that implements the method is also provided.
A method is provided for estimating channel state information in an in-band on-channel radio signal including a plurality of digitally modulated reference subcarriers. The method includes: receiving symbols transmitted on the reference subcarriers; combining the reference subcarrier symbols with a known reference sequence conjugate to produce a plurality of samples; median filtering the samples to produce filtered samples; smoothing the samples for each of the reference subcarriers over the plurality of reference subcarriers to produce a complex channel gain estimate for each of the subcarriers; and using a bias correction function to compensate for estimation bias error in the complex channel gain estimate due to the median filtering. Receivers that implement the method are also provided.
A method for processing a radio signal includes: receiving an FM in-band on-channel radio signal including a plurality of digitally modulated subcarriers in upper and lower sidebands; sampling the FM in-band on-channel radio signal to produce an input signal including complex digital samples of a combination of a desired one the upper and lower sidebands and an FM interferer; removing FM interferer components from the first signal by notch filtering to produce a notch-filtered signal; weighting the notch-filtered signal to produce a weighted notch-filtered signal; using a parametric filter to filter the input signal to produce a parametric-filtered input signal; and combining the weighted notch-filtered signal and the parametric-filtered input signal to produce an output signal. A radio receiver that implements the method is also included.
H04H 20/31 - Arrangements for simultaneous broadcast of plural pieces of information by a single channel using in-band signals, e.g. subsonic or cue signal
H04B 1/10 - Means associated with receiver for limiting or suppressing noise or interference
46.
ITERATIVE FORWARD ERROR CORRECTION DECODING FOR FM IN-BAND ON-CHANNEL RADIO BROADCASTING SYSTEMS
A method for processing a digital signal includes: receiving a plurality of protocol data units, each having a header including a plurality of control word bits; and a plurality of audio frames, each including a cyclic redundancy check code; decoding the protocol data units using an iterative decoding technique, wherein the iterative decoding technique uses a soft output decoding algorithm for iterations after the first iteration; and using decoded cyclic redundancy check codes to flag the audio frames containing errors. A receiver that implements the method is also provided.
H03M 13/41 - Sequence estimation, i.e using statistical methods for the reconstruction of the original codes using the Viterbi algorithm or Viterbi processors
H04L 1/00 - Arrangements for detecting or preventing errors in the information received
H04H 20/30 - Arrangements for simultaneous broadcast of plural pieces of information by a single channel
47.
METHOD AND APPARATUS FOR TRANSMISSION AND RECEPTION OF IN-BAND ON-CHANNEL RADIO SIGNALS INCLUDING COMPLEMENTARY LOW DENSITY PARITY CHECK CODING
A method of transmitting digital information includes: receiving a plurality of information bits representing audio information and/or data; encoding the information bits using complementary low density parity check coding to produce a composite codeword and a plurality of independently decodable semi-codewords; modulating at least one carrier signal with the forward error corrected bits; and transmitting the carrier signal(s). Transmitters that implement the method, and receivers that receive signals produced by the method, are also provided.
H04L 1/00 - Arrangements for detecting or preventing errors in the information received
H04H 20/30 - Arrangements for simultaneous broadcast of plural pieces of information by a single channel
H04L 1/04 - Arrangements for detecting or preventing errors in the information received by diversity reception using frequency diversity
H04L 5/00 - Arrangements affording multiple use of the transmission path
H03M 13/25 - Error detection or forward error correction by signal space coding, i.e. adding redundancy in the signal constellation, e.g. Trellis Coded Modulation [TCM]
H04L 1/08 - Arrangements for detecting or preventing errors in the information received by repeating transmission, e.g. Verdan system
48.
SYSTEM AND METHOD FOR RECOVERING AUDIO PDU TRANSPORT ELEMENTS IN DIGITAL RADIO BROADCAST RECEIVER
A method and apparatus are provided for recovering audio packet location fields and/or frame boundary information from a received digital radio broadcast signal frame in which there are detected errors in the signal frame header by using selected header elements and/or protocol data unit (PDU) structured data block parameters relating to minimum, maximum, and average packet length or PDU length in a scalable recovery process that may be throttled dynamically or configured statically based on available computation resources within a specific implementation and/or at a specific time.
A method and apparatus are provided for blending analog and digital portions of a composite digital audio broadcast signal by using look ahead metrics computed from previously received audio frames to guide the blending process and prevent unnecessary blending back and forth between analog and digital if the look ahead metrics indicate that future digital signal quality is degraded or impaired.
H04B 7/08 - Diversity systems; Multi-antenna systems, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
50.
ADAPTIVE BANDWIDTH MANAGEMENT OF IBOC AUDIO SIGNALS DURING BLENDING
A method and apparatus are provided for smoothly blending analog and digital portions of a composite digital audio broadcast signal by using look ahead metrics computed from previously received audio frames to dynamically adjust either stereo separation or bandwidth or both of the digital audio portion of the digital audio broadcast signal to produce an adjusted digital audio portion that is blended with the analog audio portion.
A radio receiver includes a first signal path including a first tuner configured to receive a first signal from a first antenna, and a first demodulator configured to demodulate symbols from an output of the first tuner to produce first branch metrics derived from the demodulated symbols; a second signal path including a second tuner configured to receive a second signal from a second antenna, and a second demodulator configured to demodulate symbols from an output of the second tuner to produce second branch metrics derived from the demodulated symbols; a combiner for maximum ratio combining the first branch metrics and the second branch metrics; and processing circuitry to process the combined first and second branch metrics to produce an output signal.
H04B 7/08 - Diversity systems; Multi-antenna systems, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
52.
METHOD AND APPARATUS FOR IMPLEMENTING SIGNAL QUALITY METRICS AND ANTENNA DIVERSITY SWITCHING CONTROL
A method for detecting the digital quality of a radio signal includes: receiving a radio signal including a digital portion modulated by a series of symbols each including a plurality of samples; computing correlation points between endpoint samples in cyclic prefix regions of adjacent symbols; and using the correlation points to produce a digital signal quality metric. Receivers that implement the method are also provided.
H04B 7/08 - Diversity systems; Multi-antenna systems, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
H04L 1/20 - Arrangements for detecting or preventing errors in the information received using signal-quality detector
53.
PEAK-TO-AVERAGE POWER RATIO REDUCTION FOR HYBRID FM HD RADIO TRANSMISSION
A method for reducing PAPR in a hybrid IBOC FM radio system, wherein the FM symbol and OFDM symbol are combined in time domain before PAPR reduction using clipping. Then the FM symbol is removed from the combined, clipped symbol in frequency domain before applying masking on inactive subcarriers of the radio system.
Systems, methods, and processor readable media are disclosed for encoding and transmitting first media content, second media content and triggering instructions to a digital radio broadcast receiver such that the triggering instructions arrive for immediate execution to trigger immediate rendering of the second media content in synchronization with the first media content.
A method of block deinterleaving data received at a digital radio broadcast receiver is described. The method includes providing a block of memory having n x k addresses, wherein the block comprises a single table, receiving a digital radio broadcast signal at the receiver, and demodulating the digital radio broadcast signal into a plurality of interleaved data units. For at least one series of n x k data units a pointer step size is determined, and for each data unit in the series, an address in the block is calculated based on the pointer step size, and an output data unit is read from the block at the address, such that said output data units represent block deinterieaved data units. An input data unit from the plurality of interleaved data units is then written to the block at the address. Associated systems and computer readable storage media are presented.
A digital radio broadcast system includes a processing system that receives first audio content, first program data identifying a first item for the first audio content, second audio content, and second program data identifying a second item for the second audio content such that a start of the first program data is received at the processing system within 0.5 seconds of a start of the first audio content. A digital radio broadcast signal including the audio content and the program data is processed for digital radio broadcast transmission via a transmitter. The processing system stops delivery of the first program data to the transmitter upon receipt of the second program data, the first program data thereby being truncated, and begins delivery of the second program data to the transmitter. A digital radio broadcast receiver can tag content of interest based on a user command registered at the receiver.
Systems, methods, and processor readable media are disclosed for encoding and transmitting first media content and second media content using a digital radio broadcast system, such that the second media content can be rendered in synchronization with the first media content by a digital radio broadcast receiver. The disclosed systems, methods, and processor-readable media determine when a receiver will render audio and data content that is transmitted at a given time by the digital radio broadcast transmitter, and adjust the media content accordingly to provide synchronized rendering. In exemplary embodiments, these adjustments can be provided by: 1) inserting timing instructions specifying playback time in the secondary content based on calculated delays; or 2) controlling the timing of sending the primary or secondary content to the transmitter so that it will be rendered in synchronization by the receiver.
A broadcasting method includes: using a first transmitter to send a signal including a plurality of frames of data synchronized with respect to a first GPS pulse signal, receiving the signal at a first remote transmitter, synchronizing the frames to a second GPS pulse signal at the first remote transmitter, and transmitting the synchronized frames from the remote transmitter to a plurality of receivers. A system that implements the method is also provided.
G01S 5/02 - Position-fixing by co-ordinating two or more direction or position-line determinations; Position-fixing by co-ordinating two or more distance determinations using radio waves
59.
ADAPTIVE IMPEDANCE MATCHING (AIM) FOR ELECTRICALLY SMALL RADIO RECEIVER ANTENNAS
A method of tuning an antenna circuit includes: (a) receiving a signal on an antenna, (b) producing a received signal strength indication based on the received signal, (c) using the received signal strength indication to produce a control voltage, (d) using the control voltage to control a capacitance in an antenna matching circuit, (e) changing the control voltage to minimize a ratio of a change in the received signal strength indication to a change in the control voltage and (f) repeating steps (a), (b), (c), (d) and (e). An apparatus that implements the method is also provided.
Methods and systems are disclosed for temporally aligning audio samples of digital and analog portions of a radio broadcast signal. The methods and systems comprise the steps of receiving a radio broadcast signal having analog and digital portions, producing audio samples of the analog and digital portions, retrieving a stored first time interval corresponding to an approximate time for the digital samples to traverse a receiver digital signal path, measuring a second time for data representing the digital portion to travel from a digital signal path input to a digital demodulator, generating temporal alignment of the digital audio samples relative to the analog audio samples by delaying the digital audio samples by the sum of the first and second times, temporally aligning the digital and analog samples to within a predetermined amount, and digitally combining the first and second audio samples to produce a combined audio output
A method includes: receiving a plurality of audio frames, assembling groups of the audio frames into logical recording units, storing a plurality of the logical recording units, retrieving the stored logical recording units, and decoding the retrieved logical recording units. An apparatus that performs the method is also provided.
H04H 20/31 - Arrangements for simultaneous broadcast of plural pieces of information by a single channel using in-band signals, e.g. subsonic or cue signal
H04H 60/27 - Arrangements for recording or accumulating broadcast information or broadcast-related information
62.
SYSTEMS AND METHODS FOR DC COMPONENT RECOVERY IN A ZERO-IF RADIO RECEIVER
Methods and systems for recovering a DC component in a zero-IF radio receiver are disclosed that involve receiving a frequency modulated radio frequency broadcast signal, down-converting the frequency modulated radio frequency broadcast signal directly to an original baseband frequency signal, wherein the original baseband frequency signal includes an original DC component, filtering the original baseband signal to obtain a filtered baseband signal, wherein the original DC component is removed, analyzing modulus values of the filtered baseband signal to determine an estimated quantity for the original DC component, and adding the estimated quantity for the original DC component to the filtered baseband signal to compensate for removal of the original DC component such that a reconstructed baseband signal is obtained.
A method for transmitting data between components of a digital broadcasting system includes: receiving payload data, adding a content layer header to the payload data to form a content layer data frame, adding a transmission and authentication layer header and a cyclic redundancy check field to the content layer data frame to form a transmission and authentication layer data frame, adding an application framing layer header to the transmission and authentication layer data frame to form an application framing layer data frame, and transmitting the application framing layer data frame to a destination component.
A data unit for transmitting data in a digital broadcasting system includes a first payload field, and a first byte code field having a value indicating an offset of data in the first payload field with respect to an absent value. A method for formatting the data unit includes: providing data for a payload field for a data unit, wherein the data includes an absent byte value, determining an offset between an absent byte value and other data in the payload field, shifting the data in the payload field by the offset to produce shifted bytes, and inserting a byte code in the data unit, wherein the byte code indicates the offset. A transmitter for transmitting the data units, and a receiver for receiving the data units are also provided.
H04L 29/06 - Communication control; Communication processing characterised by a protocol
H04H 20/30 - Arrangements for simultaneous broadcast of plural pieces of information by a single channel
H04H 40/27 - Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups
65.
FORWARD ERROR CORRECTION CODING FOR AM 9KHZ AND 10KHZ IN-BAND ON-CHANNEL DIGITAL AUDIO BROADCASTING SYSTEMS
A method of broadcasting an AM compatible digital audio broadcasting signal includes: producing an analog modulated carrier signal centrally positioned in a radio channel, wherein the analog modulated carrier signal is modulated by an analog signal, producing a plurality of digitally modulated subcarrier signals in the radio channel, wherein the digitally modulated subcarrier signals are modulated using complementary pattern-mapped trellis code modulation (CPTCM) including a code mapped to overlapping partitions including an upper main partition, a lower main partition, an upper backup partition and a lower backup partition, and a non-overlapping tertiary partition, and transmitting the analog modulated carrier signal and the plurality of digitally modulated subcarrier signals. Transmitters that broadcast the signal and receivers that receive the signal, and the reception method are also included.
Methods and systems for adjusting a sampling rate of a digital radio receiver are disclosed that involve receiving from a decoder a first frame of data having a first number of samples; determining at the digital radio receiver a phase difference between a receiver clock and a transmitter clock; generating at the digital radio receiver a second frame of data having a second number of samples, wherein the second number of samples depends on the phase difference between the receiver clock and the transmitter clock such that the second number of samples is less than the first number of samples if the transmitter clock is ahead of the receiver clock, and the second number of samples is greater than the first number of samples if the receiver clock is ahead of the transmitter clock; outputting the second frame of data having the second number of samples.
A service registry for a radio broadcasting system includes a memory for storing information relating to services to be provided over the broadcasting system, a processor coupled to the memory, and a core interface for exchanging messages between the processor and a plurality of users, the processor being programmed to retrieve the information from the memory in response to the messages received on the interface, and to output the retrieved information to an importer. A method of broadcasting and a broadcasting system are also provided.
H04H 60/07 - Arrangements for generating broadcast information; Arrangements for generating broadcast-related information with a direct linkage to broadcast information or to broadcast space-time; Arrangements for simultaneous generation of broadcast information and broadcast-related information characterised by processes or methods for the generation
H04H 60/14 - Arrangements for conditional access to broadcast information or to broadcast-related services
H04H 60/23 - Arrangements for conditional access to broadcast information or to broadcast-related services using cryptography, e.g. encryption, authentication or key distribution
H04H 20/28 - Arrangements for simultaneous broadcast of plural pieces of information
H04H 60/73 - Systems specially adapted for using specific information, e.g. geographical or meteorological information using meta-information
H04N 7/167 - Systems rendering the television signal unintelligible and subsequently intelligible
68.
SYSTEMS AND METHODS FOR COMMUNICATING AND RENDERING ELECTRONIC PROGRAM GUIDE INFORMATION VIA DIGITAL RADIO BROADCAST TRANSMISSION
Methods and systems for preparing data for broadcast via digital radio broadcast transmission is disclosed comprising the steps of receiving a plurality of content files corresponding to programming information for program content to be broadcast; receiving an index file having a pointer for each of the plurality of content files, wherein the index file is associated with a first logical address; storing the index file and the plurality of content files; scheduling a broadcast rotation of the index file and the plurality of content files (wherein the index file is scheduled for repeated transmission intermittently relative to selected ones of the content files); and transmitting the index file and the plurality of content files to an importer in accordance with the broadcast rotation.
A method of managing radio broadcasting services includes: generating a broadcast token including information for associating a service with one or more subscriber groups, using the broadcast token to configure a transmission of the service by a broadcaster, and broadcasting the service to the subscriber group. At the broadcaster, the service can be configured by using parameters in the broadcast token to retrieve service content from a resource manager.
An apparatus for controlling a data rate in a data client for a digital audio broadcasting system includes a buffer for storing data, a codec for coding data, and a control module for controlling a bit rate of the codec in response to a level of the data in the buffer. A method performed by the apparatus is also included.
A method for rendering an alert message on a digital radio broadcast receiver is described. A digital radio broadcast signal is received at the digital radio broadcast receiver. Data corresponding to an alert message comprising type information for identifying a type of the alert message and message information is detected. If the type information satisfies a triggering condition for a type of alert message pre-selected by a user of the digital radio broadcast receiver, the message information is rendered at the digital radio broadcast receiver. A digital radio broadcast receiver that performs the method is also described.
A signal generator includes a memory for storing content information in the form of vectors including in-phase and quadrature elements of an orthogonal frequency division multiplexing waveform, a processor for converting the vectors to a radio frequency signal, and a logic device for controlling the operation of the memory and the processor. The in-phase and quadrature elements represent baseband content of the orthogonal frequency-division multiplexing waveform.
An apparatus includes first and second speakers, and an antenna including a first pair of wires connected to the first speaker, a second pair of wires connected to the second speaker, and a conductive sleeve surrounding portions of the first and second pairs of wires, the sleeve forming a coaxial capacitor with the first and second pairs of wires. The apparatus can further include an inductor connected between the first and second pairs of wires and the sleeve, to form a resonant circuit with the coaxial capacitor.
A method for specifying content of interest using a digital radio broadcast receiver is described. A digital radio broadcast signal includes first audio content and first program data, wherein the first program data includes information identifying a first item, and includes second audio content and second program data, wherein the second program data includes information identifying a second item. A user command entered at a user interface during reception of audio content is registered, indicating a user's interest in either the first or second audio content. It is determined whether there is an ambiguity in the content of interest. If an ambiguity exists, a first data structure is stored for the first audio content, and a second data structure is stored for the second audio content. The first data structure includes the information identifying the first item, and the second data structure includes the information identifying the second item.
A method for detecting a digital radio signal includes the steps of receiving the digital radio signal, developing a correlation waveform having a peak that corresponds to a symbol boundary, normalizing the correlation waveform, calculating a peak value of the normalized correlation waveform, and dwelling on the received digital radio signal when the peak value exceeds a predetermined threshold. A receiver that performs the method is also provided.
A method for detecting a digital radio signal includes the steps of receiving the digital radio signal including a series of symbols, developing a correlation waveform having a peak that corresponds to a symbol boundary, normalizing the correlation waveform, and calculating a peak value of the normalized correlation waveform, wherein the peak value represents the quality of the received digital radio signal. A receiver that performs the method is also provided.
A method is provided for receiving and processing a digital radio broadcasting signal. The method includes the steps of receiving a digital radio broadcasting signal including content, storing encoded content, and decoding the stored encoded content to recover decoded content. The stored encoded content can include protocol data units or packets. The stored encoded content can be recovered by decoding the encoded content according to a logical protocol stack.
H04H 60/02 - Arrangements for generating broadcast information; Arrangements for generating broadcast-related information with a direct linkage to broadcast information or to broadcast space-time; Arrangements for simultaneous generation of broadcast information and broadcast-related information
An apparatus includes a network receiver for receiving an over-the-air in-band on-channel broadcast signal and extracting broadcast content from the broadcast signal, and an output for delivering the content by way of a first receiver output signal to a plurality of network player devices. A method performed by the apparatus is also included.
H04H 60/80 - Arrangements characterised by transmission systems other than for broadcast, e.g. the Internet characterised by source locations or destination locations characterised by transmission among terminal devices
79.
SYMBOL TRACKING FOR AM IN-BAND ON-CHANNEL RADIO RECEIVERS
A method for symbol tracking in AM in-band on-channel radio receivers comprises the steps of: receiving a stream of time domain samples; assembling a set of the time domain samples equal to a symbol time plus a half symbol delay in response to a symbol timing adjustment value for each symbol period; interpolating the time domain samples; partitioning the interpolated time domain samples into a first group of samples representing half-off symbols and a second group of samples representing on-time symbols; processing the first and second groups of samples to produce the symbol timing adjustment value; and outputting the second group of samples representing on-time symbols at a symbol rate. An apparatus that performs the method is also included.
A method for carrier tracking in AM in-band on-channel radio receivers comprises the steps of receiving an input signal, generating a local oscillator signal in response to an oscillator control signal, mixing the input signal with a local oscillator signal to produce a first signal, filtering the first signal to produce a filtered first signal at a decimated sample rate, detecting the phase error and frequency error of the filtered first signal normalized to mitigate effects of signal fades, and using an adaptive loop filter to produce the oscillator control signal in response to the phase error and frequency error of the filtered first signal. An apparatus that performs the method is also provided.
A method is provided for equalizing OFDM symbol vectors received on AM in-band on-channel radio signal including a main carrier and first and second BPSK modulated subcarriers. The method comprises the steps of: computing a BPSK magnitude signal; filtering the BPSK magnitude signal; filtering complex samples received on the main carrier; using the filtered BPSK magnitude signal and the filtered complex samples received on the main carrier to compute a plurality of flat fade equalization coefficients; and multiplying the OFDM symbol vectors by the flat fade equalization coefficients. A receiver that includes an equalizer, which operates in accordance with the method is also provided.
This invention provides a method of detecting time alignment of an analog audio signal and a digital audio signal in a hybrid radio system. The method comprises the steps of filtering the analog audio signal to produce a filtered analog audio signal, filtering the digital audio signal to produce a filtered digital audio signal, and using the filtered analog audio signal and the filtered digital audio signal to calculate a plurality of correlation coefficients, wherein the correlation coefficients are representative of time alignment between the analog audio signal and the digital audio signal. An apparatus for performing the method is also provided.
A method for synchronizing an exciter clock with a modem frame clock in an IBOC broadcasting system comprises the steps of receiving a plurality of modem frame pulses that are representative of the start of modem frames of audio signals and data signals, wherein timing of the modem frame pulses is controlled by a modem frame clock, producing an exciter clock signal, counting pulses representative of the exciter clock signal to produce a count representative of timing error of each incoming modem frame pulse, and controlling the exciter clock signal in response to the count. An apparatus that performs the method is also provided.
patents
