Subband acoustic echo canceller

Details Subband acoustic echo canceller Subband acoustic echo canceller

G - Physics

10

K

G10K 11/178 (2006.01) H04B 3/23 (2006.01) H04M 9/08 (2006.01)

Patent

CA 2183118

In a subband acoustic echo canceller which generates an echo replica from a subband received signal xk(m) by an estimated echo path in each subband, subtracts the echo replica from a subband echo signal yk(m) by a subtractor to generate a subband error signal ek(m) and uses an adaptive algorithm in an echo path estimation part to estimate the transfer function of the estimated echo path from the subband error signal ek(m) and the subband received signal xk(m) so that the subband error signal ek(m) approaches zero, the stop-band attenuation of each band-pass filter of a received signal subband analysis part for generating the subband received signal xk(m) is set to be smaller than the stop-band attenuation of each band-pass filter of an echo subband analysis part for generating the subband echo signal yk(m).

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