Patent ID: 9589556
Date: 2017-03-07
CPC Classifications: G10K,H04B,H04M

Claim:
1. A method for cancelling or reducing acoustic echoes in speech or audio signal enhancement processing, the method comprising: transmitting a microphone input signal wherein the microphone input signal contains one signal originating from one microphone or a mixed signal originating from multiple microphones, and the microphone input signal also contains acoustic echo signal played back by a loudspeaker and fed back to the microphone(s); employing an acoustic echo cancellation algorithm to cancel or reduce the acoustic echo signal before the microphone input signal is transmitted, wherein the acoustic echo cancellation algorithm comprises an adaptive filter; using a received reference signal to excite the adaptive filter wherein an output of the adaptive filter forms a replica signal of the acoustic echo signal; reducing adaptively the replica signal by multiplying a gain (gain<1) with the replica signal to get a gained replica signal of the acoustic echo signal wherein the gain is smaller in speech area and/or double-talk area than echo area, wherein the speech area means desired speech signal, the double-talk area means desired speech signal mixed with echo signal, and the echo area means echo only signal without desired speech signal; subtracting the gained replica signal from the microphone input signal to cancel or suppress the acoustic echo signal in the microphone input signal.