Multiplex communications – Wide area network – Packet switching
Patent
1992-11-02
1996-06-11
Chin, Wellington
Multiplex communications
Wide area network
Packet switching
379410, H04B 320
Patent
active
055263470
ABSTRACT:
A sign-based decorrelation detection and adaptive control arrangement includes structure for detecting cross-correlation between a far-end signal and an echo residual following a balance filter. During the adaptive process, if the detected correlation value is below a certain threshold, indicating that the two signals are decorrelated, the adaptation of the balancing filter is stopped. At such a point, proper echo cancellation has been achieved. Conversely, when the detected correlation value exceeds a threshold, the adaptation is ,continued until the correlation value falls below the threshold again. In any event, such decorrelation controllers are able to detect signal decorrelation and to control adaptation even in the presence of a double-talker condition.
REFERENCES:
patent: 4896318 (1990-01-01), Kokubo et al.
patent: 4922530 (1990-05-01), Kenney et al.
patent: 4947425 (1990-08-01), Grizmala et al.
patent: 4972406 (1990-11-01), Dedic
Ye et al, A New Double-Talk Detection Algorithm Based on the Orthogonality Theorem, IEEE Transactions on Communications, Nov. 1991, vol. 39, No. 11, pp. 1542-1545.
Patent Abstracts of Japan, vol. 9, No. 99, Apr. 27, 1985, & JP-A-59 225 626 (Nippon Denshin Denwa Kosha) Dec. 18, 1984.
Chen Herbert M.
Nair V. Vijayakumaran
Advanced Micro Devices , Inc.
Chin Wellington
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