Technique for reducing echoes in conference communications

Details Technique for reducing echoes in conference communications Technique for reducing echoes in conference communications

1994-02-14

1994-11-08

Dwyer, James L.

Telephonic communications

Subscriber line or transmission line interface

Network interface device

379410, 379202, 370 321, H04M 356

Patent

active

053634411

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: 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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