Patent ID: 9692882
Date: 2017-06-27
CPC Classifications: H04M

Claim:
1. A gain control system for dynamically tuning an echo canceller, the echo canceller being configured to estimate an echo of a far-end signal and subtract that estimate from a microphone signal to output an echo cancelled signal, the system comprising: an echo measurement unit configured to calculate a ratio of a first microphone signal to a first far-end signal; an attenuation unit configured to attenuate at least one of the first microphone signal and the first far-end signal to output a second microphone signal and a second far-end signal to the echo canceller, the ratio of the second microphone signal to the second far-end signal being different from the calculated ratio; and an attenuation controller configured to control the attenuation unit, in dependence on the calculated ratio, so as to alter the ratio of the second microphone signal to the second far-end signal and control the echo-cancelled signal.