MULTICHANNEL ACOUSTIC ECHO CANCELING METHOD, APPARATUS THEREOF, PROGRAM THEREOF, AND RECORDING MEDIUM THEREOF

摘要

PROBLEM TO BE SOLVED: To provide a multichannel acoustic echo canceling method capable of increasing a speed required for estimating filter coefficients in a predicted echo path even when gain ratios among a plurality of echo paths are comparatively largely different. SOLUTION: A noncausal component tap Lpcorresponding to a transfer function of an echo path in response to a future input signal and a causal component tap L-Lpcorresponding to the transfer function of the echo paths in response to the past input signals are provided to predictive echo paths 611to 61Nof each channel, a total sumσ[wn] of absolute values of filter coefficients of the noncausal component tap Lpis obtained by each channel, e.g., for 2 to 3 seconds, and as theσ[wn] is greater, an update step sizeμnof the filter coefficients Wn(k) of the corresponding channel is increased more. COPYRIGHT: (C)2005,JPO&NCIPI