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Constant amplitude carrier communications system

  • US 4,112,368 A
  • Filed: 07/13/1970
  • Issued: 09/05/1978
  • Est. Priority Date: 07/13/1970
  • Status: Expired due to Term
First Claim
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1. In a signalling system, means for generating a carrier wave, means for generating square wave pulses, means for modulating the duty ratio of said square wave unit in accordance with the amplitude of intelligence signals, means for generating code signals, means for modulo-2 adding the output of said duty ratio modulating means with the output of said code generating means, means for phase modulating said carrier and means responsive to the output of said modulo-2 adding means for controlling said phase modulating means.

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