Programmable multitone DPSK modulator

Details Programmable multitone DPSK modulator Programmable multitone DPSK modulator

1982-10-20

1985-04-16

Laroche, Eugene R.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

375 54, 375 67, H03C 300

Patent

active

045118620

ABSTRACT:
A multitone DPSK modulator produces a composite analog signal in which the phases of the tones included within the composite analog signal represent data. The modulator uses digital circuitry to synthesize a plurality of analog tones simultaneously. On a periodic basis, input digital data controls the amount by which the phase of each of the component tones is shifted. Synthesis is accomplished by periodically retrieving signals from a sine table and applying the retrieved signals to a D/A converter. A composite analog signal is sythesized by summing a retrieved signal from the sine table for each of the component tones during each sampling period. The number of tones included within the composite analog signal and the frequency, amplitude and starting phases of each of the component tones may be programmed and thus readily changed.

REFERENCES:
patent: 3617941 (1971-11-01), DeLellis

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