Patent
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.
Hecker Stuart N.
Siemens Aktiengesellschaft
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