Gain switched audio conferencing network

Details Gain switched audio conferencing network Gain switched audio conferencing network

1985-04-05

1987-12-29

Dwyer, James L.

Telephonic communications

Special services

Conferencing

379389, 370 62, H04M 356

Patent

active

047165855

ABSTRACT:
An audio conferencing system includes a plurality of remote stations (10) which are interconnected in a conference mode through a central switching network (66) through communication lines (16). Each of the remote stations has a microphone (34) and a speaker (64) associated therewith. The microphone (34) on each of the remote stations has a voltage controlled amplifier (VCA) (59) associated therewith and the speaker (64) has a VCA (60) associated therewith. A CPU (48) selectively controls the output of the microphone (34) to selectively decrease the gain thereof when voice is not detected. When voice is detected above a predetermined threshold, the microphone (34) is allowed to operate at full gain and the speaker (64) has the output level thereof decreased. This effectively reduces the audio loop gain between remote stations in a conference.

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