Patent ID: 7925007
Filing Date: 2011-04-12
Classification: H04M

Abstract:
1. A system for canceling acoustic echoes for multiple inputs, comprising: a plurality of a number of C of microphone inputs; a plurality of a number of N of speaker playback signals, each decomposed into a plurality a number of M of subbands; a plurality of adaptive filters, equal to the number of microphone inputs C times a number of subbands M, whose outputs are used to reduce echo in the plurality of microphone inputs, wherein each adaptive filter comprises a weight update, and wherein each adaptive filter processes N speaker playback signals; and a single gain computation module for each subband M employed to compute a gain vector to be used in computing the weight update of said plurality of adaptive filters equal to the number of microphone inputs C times a number of subbands M, wherein the length of the gain vector depends on the number of speaker playback signals N, and wherein the reduced echoes in the plurality of microphone inputs are computed by multiple applications and wherein several copies of the updated gain vector for each subband are sent to each of the applications.