Echo canceler with automatic enablement/disablement on a per-cal

Details Echo canceler with automatic enablement/disablement on a per-cal Echo canceler with automatic enablement/disablement on a per-cal

1994-11-29

1996-06-25

Chin, Stephen

Pulse or digital communications

Receivers

Automatic gain control

379 3, 379399, 379406, 379407, 379410, 379411, H04L 100, H04M 124, H04M 100, H04M 900

Patent

active

055307248

ABSTRACT:
Echo cancellation can be enabled to cancel echoes on an outbound transmission path based on original signals on an inbound transmission path. A controller of echo canceler enablement monitors digitized control information contained in call origination messages associated with the establishment of communications. A determination of the type of digitized information to be carried by a two-way communication channel is made. The controller causes the echo canceler to be enabled or disabled on a per-call basis based on the type of digitized information. A stand-alone echo canceler provides automatic enablement/disablement on a per-call basis based on the type of digitized information to be carried on a communication channel as determined by monitoring associated control messages.

REFERENCES:
patent: 4982428 (1991-01-01), Agazzi
patent: 5117418 (1992-05-01), Chaffee
patent: 5131032 (1992-07-01), Esaki
patent: 5148427 (1992-09-01), Buttle
patent: 5163044 (1992-11-01), Golden
"Echo Control in Today's Digital Networks", Steve Jolley, Coherent Feature Article, pp. 1, 7-10.
Iss. 2, AT&T 332-415-130, "Functional Description", pp. 2, 2-5, 2-6, 2-10 and 2-11, 1990 AT&T.
"255 T1 Echo Canceller Modules", Tellabs Technical Manual, 1992, pp. 1, 11-15.
"Coherent Eases Lane Restrictions on the Information Superhighway", Coherent News Release, Mar. 2, 1994, two descriptive text pages, two advertising pages "Automatic Echo Cancellation for ISDN without dedicated PRI Channels".
"Echo is Nagging Problem in Primary Rate Private Network", Kevin Tanzillo, Communication News, Oct., 1992, p. 49.

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