Echo canceler

摘要

An echo canceler for suppressing an echo of a receive signal contained in a transmit signal directed to a telephone circuit (6) and transferring the transmit signal subjected to echo suppression to the telephone circuit (6). The echo canceler includes a pseudo echo path (11) for attenuating and delaying the receive signal supplied from the telephone circuit (6) and adding the delayed receive signal to the transmit signal, and an echo cancel circuit (12) for estimating a transfer function of the pseudo echo path (11) on the basis of the receive signal supplied from the telephone circuit (6) and the echo of the receive signal, generating a pseudo echo on the basis of a value of the estimation and the receive signal, subtracting the pseudo echo from the transmit signal passed through the pseudo echo path (11), and thereby transferring the transmit signal subjected to echo suppression to the telephone circuit (6). <IMAGE>