This reduction of the acoustic echo residual after elimination of the echo in a device for 'hands free'

摘要

The method involves suppressing residual echo remaining after the execution of processing of echo cancellation, in frequency field and on successive frames of audio signal. Ambient noise (34) in the signal is reduced after the processing of echo cancellation. Respective values of power of residual echo are estimated on a set of frequency bands defined for the successive frames of the signal. A variable gain to each frequency band and to each frame is calculated, where respective gain being as weak as relative power estimated from the residual echo is elevated.