Echo canceller for bidirectional digital transmission

Details Echo canceller for bidirectional digital transmission Echo canceller for bidirectional digital transmission

1987-03-16

1988-07-05

Ng, Jin F.

Multiplex communications

Wide area network

Packet switching

379411, H04B 323

Patent

active

047559845

ABSTRACT:
The echo canceller for bidirectional digital transmission systems cancels the echo queues of a desired number N of digital symbols, transmitted on the line in the last N signalling periods. It consists of a part which effects very simply the summation of the last N transmitted symbols, so as to ease the system implementation by an integrated circuit, and of a part which computes the estimated sample of the echo-channel pulse response. The results of the two parts are multiplied by one another and the estimated echo signal is obtained.

REFERENCES:
patent: 4024358 (1977-05-01), Virupaksha
patent: 4581492 (1986-04-01), Virdee
C. F. N. Cowan et al., "A Non-Linear Adaptive Echo Canceller for a Digital ransmission System", (1986).
N. A. M. Verhoeckx et al., "Digital Echo Cancellation for Baseband Data Transmission", (1979).

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