System and method for utilizing inter-microphone level differences for speech enhancement

摘要

Systems and methods for utilizing inter-microphone level differences to attenuate noise and enhance speech are provided. In exemplary embodiments, energy estimates of acoustic signals received by a primary microphone and a secondary microphone are determined in order to determine an inter-microphone level difference (ILD). This ILD in combination with a noise estimate based only on a primary microphone acoustic signal allow a filter estimate to be derived. In some embodiments, the derived filter estimate may be smoothed. The filter estimate is then applied to the acoustic signal from the primary microphone to generate a speech estimate.

主权项

1. A method for enhancing speech, comprising:
receiving a primary acoustic signal and a secondary acoustic signal; executing an audio processing engine operable by a processor to perform frequency analysis on the received acoustic signals to generate a primary acoustic spectrum signal and a secondary acoustic spectrum signal, the primary acoustic spectrum signal comprising a plurality of sub-bands; determining a filter estimate for each of the plurality of sub-bands during a frame, the filter estimate for each of the plurality of sub-bands based on:
(i) a noise estimate for a respective sub-band of the primary acoustic spectrum signal;(ii) an energy estimate for the respective sub-band of the primary acoustic spectrum signal; and(iii) a level difference for the respective sub-band of the primary acoustic spectrum signal, the level difference for the respective sub-band being based on the energy estimate for the respective sub-band of the primary acoustic spectrum signal and the energy estimate for the respective sub-band of the secondary acoustic spectrum signal; and applying the filter estimate for each of the plurality of sub-bands to the respective sub-band of the primary acoustic spectrum signal to produce a speech estimate spectrum signal.