Patent ID: 8265289

Claim:
A method of divergence control in an acoustic echo cancellation (AEC) wherein a microphone signal resulting from an unobservable signal corrupted by an acoustic echo is processed in an attempt to restore the unobservable signal, the acoustic echo being a speaker signal modified by an acoustic path, wherein an adaptive filter models the echo path in the frequency domain, the adaptive filter is applied to the speaker signal to produce an echo signal that models the acoustic echo, and the echo signal is compared to the microphone signal to produce an AEC output signal that resembles the unobservable signal, the method comprising: estimating an energy of the microphone signal; estimating an energy of the echo signal; subtracting the energy of the microphone signal from the energy of the echo signal; and upon an indication that the energy of the echo signal exceeds the energy of the microphone signal, generating the microphone signal as the divergence control output, otherwise, generating the AEC output signal as the divergence control output.