DIGITAL VOICE SWITCH WITH AN ADAPTIVE DIGITALLY-CONTROLLED THRESHOLD

摘要

A voice switch for connecting voice PCM samples in a channel to an output line, said switch comprising a digital adaptive threshold generating means. The threshold level, against which voice samples are compared, is varied in accordance with the loudness of the talker by comparing the number of times the threshold is exceeded over a given period with a reference number. A variable minimum threshold level is also provided at a level just above the channel noise level.