Patent ID: 8189767
Filing Date: 2012-05-29
Classification: G10L,H04M

Abstract:
1. A method of dynamic tracking and filter divergence control in acoustic echo cancellation (AEC) wherein a microphone signal has a near-end component and a far-end component, the microphone signal resulting from an unobservable signal corrupted by an acoustic echo (the far-end component) and being 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 method comprising: receiving the microphone signal; applying the adaptive filter to the speaker signal to produce an echo signal that models the acoustic echo; subtracting the echo signal from the microphone signal to produce an output signal that resembles the unobservable signal; estimating a ratio of a far-end component energy to a total microphone signal energy; adapting the adaptive filter based on the output signal, wherein an adaptation gain is based on the ratio to achieve a balance between dynamic tracking ability and filter divergence control, wherein the far-end component energy is estimated based on the correlation between the microphone signal and the echo signal.