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Spurious free wideband phase and frequency modulator using a direct digital synthesis alias frequency band

  • US 5,886,752 A
  • Filed: 12/22/1997
  • Issued: 03/23/1999
  • Est. Priority Date: 12/22/1997
  • Status: Expired due to Term
First Claim
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1. A direct digital synthesis modulator for modulating a video signal, comprising:

  • a digital state machine receiving a digital video input signal;

    a direct digital synthesis module receiving an output signal from said digital state machine for providing direct digital synthesis of the output signal;

    a tuned frequency local oscillator providing a modulating output signal from a transmitter frequency control signal; and

    an exciter receiving the modulating output signal from said tuned frequency local oscillator for providing a modulated video signal to be transmitted.

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