Technique for reducing echoes in conference communications

Telephonic communications – Subscriber line or transmission line interface – Network interface device

Patent

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Other Related Categories

379410, 379202, 370 321, H04M 356

Type

Patent

Status

active

Patent number

053634411

Description

ABSTRACT:
Distortion and instability due to echoes in conference communications is reduced through the use of an echo estimating filter disposed in a conference bridging circuit. This circuit includes a signal combiner which receives information signals from each of the parties in the conference communications and provides an output signal which is a combination of the received information signals and an echo compensation signal. The echo estimating filter provides this echo compensation signal in response to the combiner output signal. Advantageously, the echo estimating filter can be fixed or adaptive. In the latter case, the adaptation can be in response to the received information signals or to training sequences.

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patent: 4901308 (1990-02-01), Deschaine
patent: 4991166 (1991-02-01), Julstrom
patent: 5027393 (1991-06-01), Yamamura et al.
patent: 5050160 (1991-09-01), Fuda
Jens Nedergaard et al., "An All-Digital Audioconference System", 1990 International Zurich Seminar on Digital Communications, Mar. 5-8, 1990, Eth Zurich/Switzerland, pp. 163-172.

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