Patent ID: 9544422
Date: 2017-01-10
CPC Classifications: H04B,H04M

Claim:
1. A controller for an echo suppressor configured to suppress a residual echo of a far-end signal included in a primary error signal, the controller adapted for operation with a primary adaptive filter configured to form a primary echo estimate of the far-end signal included in a microphone signal and with an echo canceller configured to cancel that primary echo estimate from the microphone signal so as to form the primary error signal, the controller comprising: a coherence estimator configured to form a first measure of coherence between the microphone signal and the primary error signal, and a second measure of coherence between the microphone signal and the primary echo estimate; and control logic configured to, when the primary adaptive filter is in a converged state, combine the first and second measures of coherence so as to form one or more first steady state decision parameters indicative of a state of the microphone signal and, in dependence on said one or more first steady state decision parameters, control activation of the echo suppressor.