Multichannel digital modulator

Details Multichannel digital modulator Multichannel digital modulator

1975-04-08

1976-07-13

Malzahn, David H.

Registers

Transfer mechanism

Traveling pawl

332 21, 332 40, H03C 500

Patent

active

039696170

ABSTRACT:
In a modulator of the type including a memory in which coded binary words representative of samples of a cycle of a sinusoidal signal are stored, which coded words are used to synthesize the modulated signal, the bits of each input digital signal S.sub.i are grouped in groups of P.sub.i bits (P.sub.i .gtoreq.1) and the sampling of the groups is so performed that several samples of each group appear in the multiplexed signal resulting from the sampling. Each sample of each group causes the reading of a coded word. This process gives a wide range of possibilities as concerns the transmission speeds of the input channels and the choice of the carrier frequency and of the number of modulation levels for each modulated signal.

REFERENCES:
patent: 3378773 (1968-04-01), Jeffers
patent: 3654450 (1972-04-01), Webb
patent: 3706945 (1972-12-01), Yanagidaira et al.
patent: 3763364 (1973-10-01), Deutsch et al.
patent: 3805191 (1974-04-01), Kawai et al.
patent: 3813528 (1974-05-01), Blanding
J. Tierney et al. "A Digital Frequency Synthesizer" IEEE Trans. on Audio & Electroacoustics, Mar. 1971 pp. 48-57.

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