Telephonic communications – Subscriber line or transmission line interface – Network interface device
Patent
1997-10-07
2000-08-22
Isen, Forester W.
Telephonic communications
Subscriber line or transmission line interface
Network interface device
379406, 379409, 379411, 370288, 370290, H04B 323
Patent
active
061084123
ABSTRACT:
This invention deals with an adaptive echo cancelling system for communication networks. The system includes an adaptive filter for acoustic echo cancellation that uses a combination of echo cancelling and gain control techniques. The main advantages of the combination of these approaches are good communication quality during double talk and easier control of the output echo level.
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Champagne Benoit Joseph Felix
Liu Qing-Guang
Isen Forester W.
Nortel Networks Corporation
Saint-Surin Jacques M.
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