Loudspeaking telephone instruments

Details Loudspeaking telephone instruments Loudspeaking telephone instruments

1975-09-22

1977-01-11

Cooper, William C.

179 1HF, H04M 908

Patent

active

040028542

ABSTRACT:
In a loudspeaking telephone arrangement using voice switching a closed-loop circuit is used to apply an averaged rectified ambient-noise signal to the comparator from one or both channels to enable proper voice switching regardless of ambient noise levels or line length.

REFERENCES:
patent: 2964598 (1960-12-01), Parker
patent: 3075045 (1963-01-01), Clemency
patent: 3725585 (1973-04-01), Moniak
patent: 3876835 (1975-04-01), Barnaby

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