Echo canceller with short processing delay and decreased...

Details Echo canceller with short processing delay and decreased... Echo canceller with short processing delay and decreased...

H - Electricity

04

B

340/72

H04B 3/23 (2006.01) H03H 21/00 (2006.01)

Patent

CA 1332187

ECHO CANCELLER WITH SHORT PROCESSING DELAY AND DECREASED MULTIPLICATION NUMBER ABSTRACT OF THE DISCLOSURE An echo canceller in a system having a long impulse response such as in an acoustic system, employing a fast Fourier transform advantageously used in view of the amount of calculations. To solve the problem of a long delay, the impulse response length is divided into a plurality of blocks. On the decreased number of samples in each block, a fast Fourier transform and finite impulse response type digital filtering are effected so that the processing delay is decreased while the amount of calculations is kept small.

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