Patent ID: 7426270

Claim:
A method of acoustic echo cancellation (AEC) wherein a microphone signal resulting from an unobservable signal corrupted by both additive background noise and 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, the method comprising: receiving the microphone signal; applying a first asymmetric nonlinear adaptive filter in fullband to the speaker signal to produce a first output signal; applying a first adaptive filter in fullband to the first output signal to produce a first echo signal that models the acoustic echo; subtracting the first echo signal from the microphone signal to produce a first echoless signal that resembles the unobservable signal; and adapting the first nonlinear adaptive filter in fullband and the first adaptive filter based on the first echoless signal.