Low complexity echo compensation

Details Low complexity echo compensation Low complexity echo compensation

H - Electricity

04

M

H04M 9/08 (2006.01) H04B 3/23 (2006.01)

Patent

CA 2610940

The present invention relates to a method for echo compensation of at least one microphone signal comprising an echo signal contribution due to a loudspeaker signal in a loudspeaker-room-microphone system, comprising the steps of converting at least a part of the at least one microphone signal to microphone sub-band signals down-sampled by a first down-sampling rate; converting the loudspeaker signal to loudspeaker sub-band signals down-sampled by a second down-sampling rate less than the first down-sampling rate to obtain first loudspeaker sub-band signals; storing the first loudspeaker sub-band signals down-sampled by the second down- sampling rate; folding the first loudspeaker sub-band signals with an estimate for the impulse response of the loudspeaker-room-microphone system in the predetermined number of sub-bands; down-sampling the folded first loudspeaker sub-band signals by a third down-sampling rate to obtain for each of the predetermined number of sub-bands an echo signal contribution that is in effect down-sampled by the first down-sampling rate; and subtracting for each sub-band the estimated echo signal contribution from the respective microphone sub-band signal to obtain error sub--band signals.

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