DIGITAL ECHO CANCELLOR

摘要

An adaptive filter estimates a channel weight vector of an echo channel usin g an affine projection (AP) update. The echo channel receives a send input sequence and a receive input sequence. The channel weight vector has first a nd second lengths when the adaptive filter operates in a first adaptation mode and a second adaptation mode, respectively. A delay estimator determines a delay in the echo channel using the adaptive filter in the first adaptation mode.