Digital direct modulator with type of modulation selection

Details Digital direct modulator with type of modulation selection Digital direct modulator with type of modulation selection

1985-05-20

1986-04-22

LaRoche, Eugene R.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

332 16R, 332 23R, 375 44, H03C 300, H03K 700

Patent

active

045845409

ABSTRACT:
The present invention uses digital values of MSK-like waveshapes which can be stored in a storage media such as a ROM and then output in a prescribed fashion such as in phase quadrature through the use of an addressing technique to the ROM. The digital values, each of N bits, are then multiplied in quadrature times a data representative signal which is divided into phase quadrature components. These N+1 bit products are summed to produce a composite digital signal representing analog bipolar values. A digital-to-analog conversion provides the modulated analog output signal.

REFERENCES:
patent: 3787785 (1974-01-01), Bass
patent: 3958191 (1976-05-01), Jones, Jr.
patent: 3987374 (1976-10-01), Jones, Jr.
patent: 4404532 (1983-09-01), Weltz
patent: 4442530 (1984-04-01), Parish, Jr. et al.
patent: 4504802 (1985-03-01), Heatherington

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