Method and apparatus for echo canceler disablement

Details Method and apparatus for echo canceler disablement Method and apparatus for echo canceler disablement

1989-11-14

1991-05-07

Ng, Jin F.

Telephonic communications

Subscriber line or transmission line interface

Network interface device

379406, 370 321, H04M 100

Patent

active

050143077

ABSTRACT:
An echo canceler is disabled by sending two signals to it or in the alternate, by sending a single signal. The two signals are bit shifted replicas of each other. The nature of the sequence of the bits within the signals assures that one of the two signals or in the alternate case, a single signal will disable the echo canceler. All of these signals are not necessarily comprised solely of tone at a predetermined frequency; rather they may merely have sufficient energy at a disabling frequency and sufficient signal noise ratio to disable the echo cancelers.

REFERENCES:
patent: 4658420 (1987-04-01), Fukushi et al.
patent: 4881221 (1989-11-01), Schroeder et al.
Telephony's Dictionary, Telephony Publishing Corp., Chicago, Illinois, pp. 1 and 199, Copyright 1986.

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