Telecommunications – Transmitter and receiver at same station – With transmitter-receiver switching or interaction prevention
Patent
1980-01-17
1981-12-08
Bookbinder, Marc E.
Telecommunications
Transmitter and receiver at same station
With transmitter-receiver switching or interaction prevention
455 83, 455116, H04B 146
Patent
active
043051545
ABSTRACT:
The transceiver according to the invention is controlled by an automatic alternation device in order to permit transmission solely when voice signals are to be transmitted and when the receiver does not receive such signals. On transmission, the transmitter supplies constant amplitude-modulated, high frequency signals during voice activity periods and supplies nothing outside these periods. On reception, a detector for detecting the rapid amplitude transitions of the received signals and a logic circuit control the switching off of an electronic switch during the voice activity periods, so that the output of the receiver only supplies voice signals. The gain of the receiver amplifier is controlled by an automatic control loop. The value of the time constant of this loop is controlled so as to be low during the voice activity periods and high outside these periods.
REFERENCES:
patent: 3283074 (1966-11-01), Csicsatka
patent: 3397401 (1968-08-01), Winterbottom
patent: 3843928 (1974-10-01), Nishimura
Ben Sadou Jean-Claude
de Riviere Charles
Deman Pierre
Pimentel Albert
"Thomson-CSF"
Bookbinder Marc E.
Chin Tommy P.
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