Speech-controlled loudspeaker telephone station circuit

Details Speech-controlled loudspeaker telephone station circuit Speech-controlled loudspeaker telephone station circuit

1979-09-07

1982-02-09

Hecker, Stuart N.

H04M 908

Patent

active

043151035

ABSTRACT:
A circuit arrangement for a speech-controlled loudspeaker telephone station incorporates a pair of operational amplifiers for receiving voltages proportional to the microphone voltage and the loudspeaker voltage, and apparatus for rectifying and comparing the output voltages of the operational amplifiers, to supply control signals for selectively controlling operation of attenuators in the transmitting and receiving channels.

REFERENCES:
patent: 3610835 (1971-10-01), Reid
patent: 3876835 (1975-04-01), Barnaby et al.

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