Adaptive acoustic echo canceller

Details Adaptive acoustic echo canceller Adaptive acoustic echo canceller

H - Electricity

04

M

H04M 1/20 (2006.01) H04M 3/18 (2006.01) H04M 9/08 (2006.01) H04R 3/02 (2006.01)

Patent

CA 2099575

An echo cancelling device (15) for reducing acoustic feedback between a loudspeaker (32) and microphone (10) in a full duplex, system such as a telephone conferencing system. A whitening filter (14) flattens the microphone signal's spectrum and reduces its auto-correlation. A signal splitter (16) separates the whitened microphone signal into a plurality of ban- dlimited microphone signals. The loudspeaker signal is similarly whitened and separated into a plurality of bandlimited loud- speaker signals by a signal splitter (30). Each of a plurality of echo cancellers (18) generates an echo estimation signal represen- ting an approximation of the acoustic feedback of a corresponding bandlimited loudspeaker signal into the microphone. The echo canceller (18) removes each echo estimation signal from the bandlimited microphone signal of the same frequency band as the estimation signal. Center clippers (20) remove any residual echo in each echo corrected signal. Noise fillers (22) simulate the background signals removed by the dippers (20).

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