ABSYSTEM AND METHOD FOR ECHO CANCELLATION

摘要

A line card (22) for coupling a subscriber line (18) to a switching network (17) the line card (22) comprising an echo canceling circuit (42) for reduci ng an echo signal received from the network and perceived at a user instrument coupled to the subscriber line. The network cancellation circuit utilizes a network model (44) to predict an echo replica signal which is then subtracte d either from the transmit (47) or receive (49) signals to the network. The li ne card (22) may include a far end echo cancellation circuit, a near end echo cancellation circuit or a combination of both.