Echo canceller

Details Echo canceller Echo canceller

1987-04-16

1989-09-19

Ng, Jin F.

Telephonic communications

Subscriber line or transmission line interface

Network interface device

370 321, H04B 323

Patent

active

048688746

ABSTRACT:
An echo canceller which cancels an echo by generating a replica of echo from the transmit data when the signal from the transmit line appears as an echo signal on the receive line, and subtracting the replica of echo from the echo signal in a circuit for connecting a transmit line and receive line to the full duplex transmission line through a hybrid circuit. The echo canceller for generating a replica of echo is composed of the first circuit which generates a replica of echo of limited length and a second circuit in which generates a replica of echo for eliminating the residual echo that is not cancelled by the first circuit.

REFERENCES:
patent: 4349889 (1982-09-01), van den Elzen et al.
patent: 4571719 (1986-02-01), Carlquist et al.
patent: 4679230 (1987-07-01), Lassaux et al.
patent: 4715064 (1987-12-01), Claessen
"Digital Echo Cancellation for Baseband Data Transmission" N. Verhoeckx et al., IEEE Transactions on Acoustics, Speech and Signal Processing, vol. ASSP-27, No. 6, Dec. 1979, pp. 768-781.

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