Method and apparatus for multi-channel acoustic echo cancellatio

Details Method and apparatus for multi-channel acoustic echo cancellatio Method and apparatus for multi-channel acoustic echo cancellatio

1996-09-25

1998-06-02

Tran, Sinh

Electrical audio signal processing systems and devices

Dereverberators

381 66, 381 941, 381 71, 379410, H04B 320

Patent

active

057613184

ABSTRACT:
In a multi-channel acoustic echo cancellation, received signals in a plurality of channels are radiated as acoustic signals by a plurality of loudspeakers, received signal vectors in these channels are combined into a combined vector and a rearranged received signal vector in the case of at least two channels being exchanged is generated. By inputting the combined received signal vector into an echo replica generating part which simulates echo paths from the loudspeakers to at least one microphone, an echo replica is generated. The echo replica is subtracted from an echo output from the microphone to obtain a residual echo. Based on the relationship between the received signal vector and the corresponding residual echo and between the rearranged received signal vector and the corresponding approximated residual echo, an adjustment vector is obtained which is used to adjust the estimated echo path vector representing an impulse response of the echo replica generating part.

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