Apparatus for echo cancellation, in particular for a data...

Details Apparatus for echo cancellation, in particular for a data... Apparatus for echo cancellation, in particular for a data...

H - Electricity

04

N

350/34

H04N 7/08 (2006.01) H04B 3/23 (2006.01)

Patent

CA 1217856

ABSTRACT Echo cancellation is carried out on a received demodulated analog signal. The apparatus comprises an analog transversal filter, a computing circuit for generating the direct coefficients al to ar and, eventually, feedback coefficients b2 to bm of an analog transversal filter. The input of a computing circuit is connected to the input of an analog transversal filter. The computing circuit is comprised of an analog-to-digital converter, whose output is connected to a self-adaptive digital transversal filter. The values of the digital transversal filter multiplication coefficients are applied, as coefficients, to the multipliers of the analog transversal filter. The optimization criterion is that of the mean quadratic error. The convergence algorithm is that of the gradient. The iterative correction may be carried out at each step on the digital transversal filter's group of coefficients. Or, it can be carried out cyclically on each of the digital transversal filter's coefficients. Variations Or the self-adaptive digital transversal filter are described.

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