Adaptive microphone sampling rate techniques

摘要

An apparatus for adjusting a microphone sampling rate, the apparatus including an input to receive an audio signal from a microphone and a front-end processing module. The front-end processing module is to generate a plurality of frames from the audio signal received by the microphone, determine a noise profile using the plurality of frames, and adjust a sampling rate of the microphone based on the determined noise profile.

主权项

1. An apparatus for adjusting a microphone sampling rate, the apparatus comprising:
an input to receive an audio signal from a microphone; and a front-end processing module to: generate a plurality of frames from the audio signal received by the microphone; determine a spectral energy representation of each of the plurality of frames, the spectral energy representation including N-points when the microphone sampling rate of is a first sampling rate, the spectral energy representation including M-points when the sampling rate is a second sampling rate that is less than the first sampling rate, where M is less than N; map and scale at least some of the M-points to the N-points when using the second sampling rate, prior to calculating at least one Mel-frequency cepstral coefficient (MFCC); determine a noise profile using the plurality of frames; adjust the sampling rate of the microphone based on the determined noise profile; calculate the at least one MFCC for each of the plurality of frames; and detect a presence of a human voice based on the at least one MFCC.