H - Electricity – 04 – B
Patent
H - Electricity
04
B
325/15
H04B 1/40 (2006.01) H04B 1/46 (2006.01)
Patent
CA 1151734
ABSTRACT OF THE DISCLOSURE TRANSCEIVER The transceiver according to the invention is controlled by an automatic alternation device in order to permit the transfert to transmission solely when voice signals are to be transmitted and when the re- ceiver 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, detection means for detecting the rapid amplitude tran- sitions 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. A classical voice- noise discriminator validate this decision. The receiver also has an amplifier of the signals received, whose gain 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.
344137
Ben Sadou Jean C.
de Riviere Charles
Deman Pierre
Pimentel Albert
Goudreau Gage Dubuc
Thomson-Csf
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