ECHO REMOVER, ELECTRONIC CONFERENCE APPARATUS, AND ECHO REMOVING PROGRAM

摘要

PROBLEM TO BE SOLVED: To more surely remove an echo component of a sound pickup signal irrespective of the presence of the occurrence of double talk. SOLUTION: An echo component removal part 512 estimates the echo component with an adaptive filter in a time domain from the sound pickup signal and a reference voltage corresponding to a voice to be reproduced and output to remove the echo component from the sound pickup signal. A parameter updating part 513 updates an adaptive filter parameter 501 in response to an update amountμdesignated by aμcalculation part 520. The update amountμof the adaptive filter parameter 501 is designated by theμcalculation part 520 in response to coherence between an error signal yielded by removing the echo component from the sound pickup signal and the reference signal. It is therefore possible to securely control the operation such that the update amount is optimized on the occurrence of the double talk. This improves the quality of the error signal. COPYRIGHT: (C)2007,JPO&INPIT