Echo cancelling device

摘要

Echo canceller, canceling an echo signal y (t), generated by a signal x (t), comprising a transversal digital filter whose N weighting coefficients Ci, correlated with N coded samples of x (t) enable the forming of a synthetic echo signal y (t) and comprising an adaptive control loop adjusting the coefficients Ci, characterized in that the adaptive control loops effects the correlation between the signs of the N coded samples of x (t) and of the residual echo signal gamma (t) and determines the correction DELTA Ci adjusting the coefficients Ci by multiplication of the residual signal ¦ epsilon (t) ¦ by a coefficient alpha close to zero accompanied by the sign of the aforementioned correlation of signs.