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Methods and apparatus for reducing intelligible crosstalk in single sideband radio systems

  • US 4,019,140 A
  • Filed: 10/24/1975
  • Issued: 04/19/1977
  • Est. Priority Date: 10/24/1975
  • Status: Expired due to Term
First Claim
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1. In a transmission system of the type wherein information is transmitted from a first to a second location, said system including, at said first location:

  • means for generating a carrier wave; and

    means for modulating the amplitude of said carrier wave with said information, the improvement which comprises;

    means for generating a coding signal; and

    means, positioned intermediate said carrier wave generating means and said amplitude modulating means, for phase-modulating said carrier wave with said coding signal thereby to encode the amplitude-modulated output of said modulating means whereby any interfering signal which enters the transmission system and which is not similarly encoded is spread, in the frequency domain, and thus rendered unintelligible.

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