Patent ID: 7333447
Filing Date: 2008-02-19
Classification: H04M

Abstract:
1. A packet voice transceiver adapted to reside at a first end of a communication network and to send and receive voice packets to and from a second packet voice transceiver residing at a second end of the communication network, the packet voice transceiver comprising: a voice encoder operable to receive an ingress audio signal and to encode the audio signal to produce an ingress packet voice signal; a packet transmitter operable to transmit the ingress packet voice signal over the network to the second packet voice transceiver; a packet receiver operable to receive an egress packet voice signal transmitted over the network by the second packet voice transceiver; a voice decoder operable to decode the egress packet voice signal to produce an egress audio signal; a far-end echo canceller operable to reduce echo that is present in the egress audio signal and that originated at the second end, the far-end echo canceller including an echo path model that models an actual echo path, wherein the far-end echo canceller is able to adapt its echo path model during operation; and a near-end echo canceller operable to reduce echo that is present in the ingress audio signal and that originated at the first end, the near-end echo canceller including an echo path model that models an actual echo path, wherein the near-end echo canceller is able to adapt its echo path model during operation; wherein the far-end echo canceller is operable to provide a status signal to the near-end echo canceller, the status signal being indicative of whether the far-end echo canceller is actively adapting its echo path model, and wherein the near-end echo canceller is operable to refrain from adapting its echo path model if the far-end echo canceller is actively adapting its echo path model.