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DATA MODULATOR EMPLOYING SINUSOIDAL SYNTHESIS

  • US 3,623,160 A
  • Filed: 09/17/1969
  • Issued: 11/23/1971
  • Est. Priority Date: 09/17/1969
  • Status: Expired due to Term
First Claim
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1. A digital data modulator responsive to a bivalued digital data signal to produce a modulated signal, said modulator comprising:

  • modulation-encoding means responsive to said bivalued digital data signal to produce an encoded pulse train, one characteristic of which is varied according to the selected type of modulation;

    a square wave generator responsive to said encoded pulse train to produce n square waves, all of which have the same variable characteristic as said one characteristic of the pulse train, and all of which are phase displaced from one another;

    a summation network for summing said n square waves with weightings to produce an approximate sinusoidal wave, a like characteristic of which varies according to the variations of the characteristics of said square waves and pulse train, the relative square wave displacements and summation network weightings being such as to eliminate a selected set of harmonics of the fundamental frequency of the approximate sinusoidal wave; and

    means for filtering said approximate sinusoidal wave to produce said modulated signal.

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