METHOD, APPARATUS AND PROGRAM FOR SUPPRESSING MULTI-CHANNEL ACOUSTIC ECHO, AND RECORDING MEDIUM

摘要

PROBLEM TO BE SOLVED: To propose a method and an apparatus for suppressing multi-channel acoustic echoes required when realizing an audio teleconference system of a multi-channel sound amplification type. SOLUTION: The method for suppressing multi-channel acoustic echoes includes steps of: adding an additional signal to a received signal for varying inter-channel correlation to make a speaker reproduced signal; generating an n-channel pseudo echo from the speaker reproduced signal; obtaining an n-channel error signal from a sound pickup signal and the n-channel pseudo echo; obtaining a correction vector from the n-channel error signal and an M-channel reproduction signal; and sequentially correcting a pseudo echo path by means of the correction vector. The pseudo echo path includes a non-causal component, the error signal between the delayed sound pickup signal and the pseudo echo is used in correcting the pseudo echo path, coincidence between the echo path and the pseudo echo path is obtained from a magnitude of the non-causal component, and the magnitude of the additional signal for varying the channel correlation in the received signal is controlled depending on the coincidence. COPYRIGHT: (C)2006,JPO&NCIPI