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Communication

  • US 4,351,064 A
  • Filed: 01/31/1973
  • Issued: 09/21/1982
  • Est. Priority Date: 10/30/1970
  • Status: Expired due to Term
First Claim
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1. Communication apparatus for communicating intelligence including a transmitter unit having(a) a transmitter network for producing a carrier,(b) input means, connected to said network, for modulating said carrier with an input signal containing intelligence to be communicated, and(c) modulator means, connected to said network, for impressing on said carrier a pseudo-noise code,(d) a receiver unit having a receiver network for receiving the output of said transmitter including said intelligence and conditioning said output to be converted into intelligence perceptable form said receiver network being of the type including means for demodulating a modulated carrier, the said demodulating means including a limiter;

  • (e) an auto-correlation network including a first correlation branch conducting the modulated carrier and a second correlation branch conducting the modulated carrier;

    (f) means connected to said correlation network, for dephasing the output of one of said branches with respect to the output of the other of said branches to produce a signal, dependant on the sum of the outputs of said branches, capable of being passed by said limiter;

    (g) means connected to said first and second branches for impressing said sum-dependent signal on said receiver network, and(h) means, connected to said receiver network and to said correlation network, for impressing on said sum-dependant signal a tracking signal manifested by a variation of the phase of the sum-dependant signal impressed on said receiver network and capable of being passed by said limiter said tracking signal cooperating with said sum-dependant signal to actuate said auto-correlation network to auto-correlate said code; and

    communication means between said transmitter network and said receiver network.

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