Patent ID: 7477735
Filing Date: 2009-01-13
Classification: H04M

Abstract:
1. An audio echo canceller adjusted to provide an echo attenuated output signal from an echo added input signal including near-end audio in addition to far-end audio adding an echo contribution, comprising: a mono echo compensator configured to generate a mono echo estimate by implementing a first adaptive model of acoustic echo, converging to minimize a mono part of the echo contribution in the echo added input signal; a first subtracting unit configured to subtract the mono echo estimate from the echo added input signal to generate a first output signal; one or more multi component audio detectors configured to detect whether multi component audio is present in the far-end audio; a stereo echo compensator configured to generate a stereo echo estimate by implementing a second adaptive model of acoustic echo; and a second subtracting unit configured to subtract the stereo echo estimate from the first output signal to generate a second output signal, wherein the mono echo compensator is configured to suspend converging to minimize the mono part of the echo contribution in the first adaptive model when said one or more multi component audio detectors detects multi component audio in the far-end audio, and the stereo echo compensator is configured to suspend converging in the second adaptive model when said one or more multi component audio detectors does not detect multi component audio in the far-end audio.