ECHO CANCELLER ARRANGEMENT COMPRISING QUASI-STATIC ECHO CANCELLERS AND A SMALLER NUMBER OF SELF-ADAPTIVE ECHO CANCELLERS

An echo canceller arrangement for a plurality of channels comprises an equal plurality of quasi-static echo cancellers for the respective channels and a smaller number of self-adaptive echo cancellers which are coupled with a group of quasi-static echo cancellers for an equal smaller number of selected channels. Channel selection is successively varied in such a manner that various groups of all quasi-static echo cancellers are successively coupled with the self-adaptive echo cancellers. One of the echo path models retained by each self-adaptive echo canceller and by the quasi-static echo canceller coupled with the last-mentioned self-adaptive echo canceller is rewritten with reference to the other when the above-mentioned other model gives a significantly worse approximation of the characteristics of the concerned actual echo path than the above-mentioned one model.