ECHO SUPPRESSION APPARATUS, ECHO SUPPRESSION METHOD, ECHO SUPPRESSION PROGRAM AND RECORDING MEDIUM THEREFOR

摘要

PROBLEM TO BE SOLVED: To provide an echo suppression apparatus in which computational complexity is reduced and echo suppression is performed in a short period of time. SOLUTION: In the echo suppression apparatus, frequencies of a regenerative signal and a sound collecting signal are analyzed respectively, and a correction amount is determined from an amplitude ratio of frequency components of the signals while a difference between the frequency of the regenerative signal in a local peak and the frequency of the sound collecting signal in a local peak is settled within a predetermined range. A frequency component of the sound collecting signal suppressed selectively based on the determination of magnitudes between a result of correcting an amplitude spectrum of the regenerative signal with the correction amount and an amplitude spectrum of the sound collecting signal (frequency component of an echo suppression signal) is then converted into a time domain, and an output signal is obtained. COPYRIGHT: (C)2007,JPO&INPIT