Echo canceller

Details Echo canceller Echo canceller

1984-12-04

1987-07-21

Rubinson, Gene Z.

Telephonic communications

Subscriber line or transmission line interface

Network interface device

379410, 370 321, H04B 323

Patent

active

046823581

ABSTRACT:
Apparatus and a technique for echo cancellation is described in which the real and imaginary parts of an echo replica signal can evolve independently of each other. By removing the coupling heretofore found in cross coupled echo canceller structures, the echo replica obtained in conjunction with carrier-phase tracking circuitry can be a more exact duplicate of the real and imaginary components of a received echo containing signal. The echo canceller may include a plurality of subcancellers, each including at least four adaptive filters. Alternatively the filters within each subcanceller can be implemented by a suitably programmed digital signal processor.

REFERENCES:
patent: Re31253 (1983-05-01), Weinstein
patent: 3721777 (1973-03-01), Thomas
patent: 4072830 (1978-02-01), Gitlin et al.
patent: 4162378 (1979-07-01), Baudoux et al.
patent: 4355214 (1982-10-01), Levy et al.
patent: 4370741 (1983-01-01), Haass
patent: 4574166 (1986-03-01), Gritton
patent: 4577309 (1986-03-01), Barazeche et al.
"A Passband Data-Driven Echo Canceller for Full-Duplex Transmission on Two-Wire Circuits", S. B. Weinstein, Jul. 1977 IEEE Trans. on Communications, pp. 654-666.

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