Process and device for digital frequency generation

Details Process and device for digital frequency generation Process and device for digital frequency generation

1985-05-06

1986-07-08

Thomas, James D.

Boots, shoes, and leggings

G06F 102

Patent

active

045997004

ABSTRACT:
The present invention relates to frequency generation of digital type, said frequencies being able to take values included in the 0.4000 Hz band. The invention consists in using the periodicity of the sine function on (0,2 .pi.), in making samples correspond to each frequency f, each sample being represented by a triplet P, Q, S, P representing the rank, Q being a function of the quadrant to which said sample belongs on (0,2 .pi.) S the sign, in memorizing 1/4T samples of the sine wave of frequency 1 Hz on (0,.pi./2), T being the sampling period, and in causing to correspond to any sample Y.sub.N indicative of the frequency f (Y.sub.N =sin 2.pi.P T) a sample of triplet (P, Q, S) of rank Nf chosen from the 1/4T samples, said correspondence being biunivocal. The invention is applicable to the generation of tones, to inter-exchange signalling in particular.

REFERENCES:
patent: 3735269 (1973-05-01), Jackson
patent: 3772681 (1973-11-01), Skingle
patent: 3898446 (1975-08-01), Vatz
patent: 4114189 (1978-09-01), Davis
patent: 4482974 (1984-11-01), Kovalick
Kinsel et al, "A Digital Signal Generator", IEEE Micro, vol. #1, No. 4, pp. 6-15, Nov. 1981.

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