Multichannel acoustic echo reduction

摘要

A multichannel acoustic echo reduction system is described herein. The system includes an acoustic echo canceller (AEC) component having a fixed filter for each respective combination of loudspeaker and microphone signals and having an adaptive filter for each microphone signal. For each microphone signal, the AEC component modifies the microphone signal to reduce contributions from the outputs of the loudspeakers based at least in part on the respective adaptive filter associated with the microphone signal and the set of fixed filters associated with the respective microphone signal.

主权项

1. A method executed by a processor of a computing device, the method comprising:
transmitting a first calibration signal to a first speaker, the first calibration signal causing the first speaker to generate first output; transmitting a second calibration signal to a second speaker subsequent to transmitting the first calibration signal to the first speaker, the second signal causing the second speaker to generate second output; receiving a first microphone signal from a first microphone, the first microphone signal corresponding to the first output from the first speaker; receiving a second microphone signal from the first microphone, the second microphone signal corresponding to the second output from the second speaker; computing a first coefficient of a first fixed filter for the first microphone based upon the first calibration signal and the first microphone signal; computing a second coefficient of a second fixed filter for the first microphone based upon the second calibration signal and the second microphone signal; and subsequent to computing the first coefficient of the first fixed filter and the second coefficient of the second fixed filter, applying the first fixed filter and the second fixed filter to an acoustic signal captured by the first microphone.