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MODULATION SYSTEM

  • US 3,778,718 A
  • Filed: 04/28/1972
  • Issued: 12/11/1973
  • Est. Priority Date: 04/28/1972
  • Status: Expired due to Term
First Claim
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1. A modulation system comprising:

  • a source of modulating signal having a high-frequency portion and a low-frequency portion;

    a frequency modulator for producing a frequency-modulated signal in response to said low-frequency portion of said modulating signal;

    a suppressed-carrier amplitude modulator having an input coupled to the output of said frequency modulator for modulating said frequency-modulated signal by said high-frequency portion of said modulating signal to produce a suppressed-carrier amplitude-modulated signal; and

    means coupled to the outputs of said frequency-modulator and said suppressed carrier amplitude modulator for combining said frequency-modulated signal and said suppressed-carrier amplitude modulated signal to provide a combined modulated signal.

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