Adjustable echo canceller.

摘要

An adjustable echo canceller used in a telecommunication system and including a digital filter (DIH) of which the coefficients (a0-a3, B) are calculated by software programs (PROG1-PROG4) after measurement of signals. The contributions of these coefficients to the output signal of the canceller are measured and compared to measures of an echo signal obatined when the filter is not active. These measures are realized from a location common to several communication line circuits each including a canceller.