Residual echo elimination with proportionate noise injection

Details Residual echo elimination with proportionate noise injection Residual echo elimination with proportionate noise injection

H - Electricity

04

M

H04M 3/18 (2006.01) H04B 3/20 (2006.01) H04B 3/23 (2006.01)

Patent

CA 2088684

An echo canceller (20) with an adaptive convolution processor (50) for computing and subtracting an anticipated echo, in- cluding a nonlinear processor (82) which attenuates the error signal over a continuous range. A noise injection source (83) cou- pled to the send output variably injects an artificial noise signal in inverse proportion to error signal attenuation. The gradual ad- justment of error signal attenuation and maintenance of the output noise level at the average background noise level of the input, make operation of the echo canceller (20) unnoticeable to a far end listener.

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