Patent Document ID: 8385557
Application ID: 12141941
Patent Status: 1

Claim One:
1. A multichannel acoustic echo reduction system comprising: a signal receiving component that receives a plurality of loudspeaker signals that drive a plurality of respective loudspeakers, and further receives one or more microphone signals generated by one or more respective microphones based at least in part on outputs from the loudspeakers; 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, wherein 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; and a calibration component that provides coefficients that configure each of the fixed filters, wherein the calibration component sequentially includes a calibration signal in each loudspeaker signal and determines the coefficients for each fixed filter based at least in part on the microphone signals received during time periods for which the calibration signals are included in the loudspeaker signals.