Digital phase domain amplitude modulation method and apparatus

Details Digital phase domain amplitude modulation method and apparatus Digital phase domain amplitude modulation method and apparatus

1980-02-29

1982-05-25

Grimm, Siegfried H.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

328168, 332 9R, 455116, H03C 150

Patent

active

043319416

ABSTRACT:
A modulating signal is applied to an analog-to-digital converter which addresses a read-only memory phase look-up table. The read-only memory phase look-up table output is applied to a polarity generator. The polarity generator output and output from a phase accumulator are input to a phase adder. The phase adder output is applied to the input of a sine look-up read-only memory whose output is applied to a digital-to-analog converter and low-pass filtered to produce an amplitude-modulated carrier signal. The invention thereby digitally amplitude modulates a carrier signal in the phase domain without any multiplication being required.

REFERENCES:
patent: 3958191 (1976-05-01), Jones, Jr.
patent: 3988540 (1976-10-01), Scott et al.
patent: 4100369 (1978-07-01), Stenstrom et al.

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