Digitized phase modulating means

Details Digitized phase modulating means Digitized phase modulating means

1978-10-03

1980-06-03

Grimm, Siegfried H.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

375 67, 332 16R, 332 21, H04L 2720

Patent

active

042064236

ABSTRACT:
A digitized phase modulating system in which a clock pulse signal of frequency C.sub.a is divided by a counter of count capacity N, which when N=4, produces four signals having phases spaced at intervals of 0.degree., 90.degree., 180.degree. and 270.degree.. Signal selecting logic means including counting means is responsive to data clock pulses of frequency mf.sub.s (where m is an integer) and to the binary contents of successive states of a binary modulation sequence of bit rate f.sub.s to successively select various ones of said four signals whose successive phases are indicative of the contents of said successive states of said binary modulation sequence.

REFERENCES:
patent: 3983485 (1976-09-01), Stuart
Volertas et al., "Phase Modulation Techniques for Digital Communication Systems", International Telecommunications Conference Proceedings, Oct. 9, 1977, pp. 1-7.

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