Echo canceller and method for controlling echo cancellation

Details Echo canceller and method for controlling echo cancellation Echo canceller and method for controlling echo cancellation

1994-09-06

1996-07-02

Hofsass, Jeffery

Telephonic communications

Subscriber line or transmission line interface

Network interface device

379406, 370 321, H04M 158

Patent

active

055331211

ABSTRACT:
An echo canceller is disclosed which is capable of disabling its echo cancelling function when other echo cancellers are connected in tandem in a communications network. A pattern is inserted by extracting bits from a receiving side pulse code modulation (PCM) signal bit stream and replacing them with a predetermined bit-pattern sequence. When the predetermined bit-pattern sequence is detected at a transmission side input PCM signal bit stream, the echo cancelling function is disabled.

REFERENCES:
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patent: 4881221 (1989-11-01), Schroeder et al.
patent: 4945533 (1990-07-01), Schroeder et al.
patent: 5014307 (1991-05-01), Joffe et al.
patent: 5029204 (1991-07-01), Shenoi et al.
patent: 5123009 (1992-06-01), Winter
patent: 5420921 (1995-05-01), Lahdemaki

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