Conferencing system adaptive signal conditioner

Details Conferencing system adaptive signal conditioner Conferencing system adaptive signal conditioner

1983-06-16

1985-08-13

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

381 47, H04Q 1104

Patent

active

045354456

ABSTRACT:
The disclosed arrangement of digital signal processor and echo cancellor is connectable to four wire transmission facilities on a per port basis for providing adaptive signal conditioning to reduce noise and improve level contrast among conferees of a digital conference connection. The digital signal processor applies an adaptive gain value to incoming speech signals for either increasing or decreasing the level of these signals to meet a predetermined threshold. A fixed gain adjustment is applied to incoming noise signals to reduce the level of these signals. The arrangement also provides a last-talker holdover mode in which the last gain adjustment applied to last-talker speech is applied to idle channel noise on that line.

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"Network Services Audio Bridge", J. H. Bobsin et al., IEEE International Conference on Communications, Jun. 15, 1982, pp. 4E.3.1-4E.3.5.

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