Multi-channel echo canceling method and apparatus

Details Multi-channel echo canceling method and apparatus Multi-channel echo canceling method and apparatus

1992-03-13

1995-03-07

Dwyer, James L.

Telephonic communications

Subscriber line or transmission line interface

Network interface device

379411, 379388, 370 321, H04M 100

Patent

active

053965540

ABSTRACT:
Echo canceling method and apparatus for subtracting, from a mixed signal in which echoes produced from a plurality of reception signals are mixed with a transmission signal, a replica of the echoes in order to cancel the echoes in the mixed signal. The replica of the echoes are generated by the steps of selecting the reception signal which is leading in phase and producing a replica of the echoes from the selected reception signal by an adaptive filter. Generally, the replicas are produced by adaptive filters provided in one-to-one correspondence with the mixed signals.

REFERENCES:
patent: 5027393 (1991-06-01), Kamamura et al.
B. Widrow et al., "Adaptive Noise Cancelling: Principles and Applications", Proc. of IEEE, vol. 63, No. 12, pp. 1692-1716, Dec. 1975.
J. Nagumo and A. Noda, "A Learning Method for System Identifcation", IEEE Trans. on Automatic Control, vol. AC-12, No. 3, pp. 282-287, Jun. 1967.
B. Widrow et al., "Adaptive Signal Processing", Prentice-Hall, N.J., 1985, pp. 147-153.
M. L. Honing et al, "Adaptive Filters", pp. 145-245, Kluwer Academic Publishers, Hingham, Mass. 02043.

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