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Single-channel-per-carrier communication system including a voice-activated transmission power controller

  • US 4,706,243 A
  • Filed: 05/30/1985
  • Issued: 11/10/1987
  • Est. Priority Date: 06/01/1984
  • Status: Expired due to Term
First Claim
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1. A single channel-per-carrier modulation system comprising:

  • modulator means for modulation an input carrier wave in response to an input channel signal and providing a modulated carrier wave;

    detector means for detecting the presence of the input channel signal;

    gate circuit means responsive to a channel connection signal for supplying the input carrier wave to the modulator means only when the channel connection signal indicates that the associated channel is in the connection; and

    level control means responsive to at least the output of the detector means for imparting to the modulated carrier wave a predetermined attenuation when the associated channel is in connection but there is no input channel signal present, whereby the modulated carrier wave is continuously transmitted when the associated channel is in connection, regardless of the presence or absence of an input channel signal.

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