FAST DETERMINATION OF A FREQUENCY OF A RECEIVED AUDIO SIGNAL BY MOBILE PHONE
|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)|
AbrégéSystems, 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.