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

332 16R, 375 67, H03K 706

Patent

active

042064244

ABSTRACT:
A digitalized phase modulating means in which a two level binary modulated sequence from a data source of bit rate f.sub.s is supplied to a pulse add/delete circuit. Also supplied to such pulse add/delete circuit is a train of clock pulses of frequency C.sub.a, and a train of add/delete pulses having a repetition rate mkf.sub.s, where m and k are integers. The pulse add/delete circuit responds to a binary bit of value 1 or 0 to add or delete the said add/delete pulses to the train of clock pulses at a given rate, such as mk pulses per data bit period 1/f.sub.s. The altered clock pulse train is then supplied to a divider which divides by 4k to produce a cyclical output whose phase is advanced or retarded by 1/4k of 360.degree. each time a pulse is added or deleted from the clock pulse train C.sub.a. By changing the value of k and by either only adding pulses to, or by only deleting pulses from, the clock pulse train, or by both adding and deleting pulses, several different forms of phase modulation can be effected.

REFERENCES:
patent: 2430139 (1947-11-01), Peterson
patent: 3689914 (1972-09-01), Butler
patent: 4049909 (1977-09-01), Peck
V. F. Volertas et al., "Phase Modulation Techniques for Digital Communication Systems," International Telecommunications Conference Proc., 10-9-77, p. 6.

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