Patent ID: 6961422
Filing Date: 2005-11-01
Classification: H04M,Y02D

Abstract:
1. A gain control method for acoustic echo cancellation and suppression for use with a full duplex voice terminal receiving a far-end signal from a far-end voice terminal and sending a transmit signal to the far-end voice terminal, the full duplex voice terminal having an adaptive filter, a speaker and a microphone, the method comprising: playing the far-end signal at the speaker; receiving an echo signal that is acoustically coupled from the speaker to the microphone, wherein the echo signal is a portion of the far-end signal played at the speaker; filtering the far-end signal by the adaptive filter to generate a filtered signal; calculating an error signal, wherein the error signal is the difference between the echo signal minus the filtered signal; calculating an attenuation factor, comprising: calculating the transmit signal, wherein the transmit signal is the product of the attenuation factor times the error signal.