FAST DETERMINATION OF A FREQUENCY OF A RECEIVED AUDIO SIGNAL BY MOBILE PHONE

Registre Brevet WIPO
Numéro d'application US2018038441
Numéro de publication 2018/236963
Statut Délivré - en vigueur
Date de dépôt 2018-06-20
Date de publication 2018-12-27
Propriétaire CUBIC CORPORATION (USA)
Inventeur(s) Vilhelmsen, Tom

Abrégé

Systems, methods, and devices for determining a frequency of a received audio signal. A device may include a microphone, a speaker, and a processor configured to perform operations including receiving, using the microphone, a first audio signal having a predetermined frequency. The operations may also include, for each test frequency of a plurality of test frequencies and for each test phase of a plurality of test phases, generating a second audio signal having the test frequency and the test phase, outputting, using the speaker, the second audio signal, receiving, using the microphone, a combined audio signal being a combination of the first audio signal and the second audio signal, determining an amplitude of the combined audio signal, and determining that the predetermined frequency is within a threshold range of the test frequency when the amplitude of the combined audio signal is below a threshold.

Classes IPC  ?

  • G07C 9/00 - Individual registration on entry or exit
  • G01R 23/00 - Arrangements for measuring frequencies; Arrangements for analysing frequency spectra