Method of converging an echo canceller

Details Method of converging an echo canceller Method of converging an echo canceller

1993-06-23

1995-01-10

Dwyer, James L.

Telephonic communications

Subscriber line or transmission line interface

Network interface device

379406, 379407, 379411, 379402, 370 32, 370 321, 370 24, H04M 908

Patent

active

053814746

ABSTRACT:
Converging of an echo canceller (4A-D) integrated into a telephone exchange (1, 2) is initiated at the start of a telephone call by an internal command of the telephone exchange given by a call control (2) of the telephone exchange as soon as the call control (2) has observed an off-hook state of a called subscriber connection. The command causes the echo canceller (4A-D) to transmit a test signal to the echo path for converging the echo canceller before appearance of the speech signal.

REFERENCES:
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patent: 3735055 (1973-05-01), Thomas
patent: 4425483 (1981-03-01), Lee et al.
patent: 4593161 (1986-06-01), Desblache et al.
patent: 4727566 (1988-02-01), Dahlqvist
patent: 4827472 (1989-05-01), Ferrieu
patent: 4887257 (1989-12-01), Belloc et al.
patent: 5008923 (1991-04-01), Kitamura et al.

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