System for frequency modulation

Modulators – Amplitude modulator – Nonlinear device controlled by modulating signal

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332 9R, 375 62, H03C 300

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active

045477515

ABSTRACT:
A system for frequency modulation which generates first and second signals having different frequencies in a switching manner in accordance with the logical value of an input signal. The system includes an oscillator for generating a signal having a predetermined frequency; first and second frequency-dividers for subjecting the signal generated by the oscillator to frequency division by different integers l and m to generate first and second signals which are synchronized with each other; a third frequency-divider for subjecting an output signal from said second frequency-divider to frequency division by an integer n selected so that the product m.times.n is the least common multiple of l and m; a control device for controlling input data with an output signal from said third frequency-divider; and a switching device for selecting one of the output signals from the first and second frequency-dividers in accordance with the logical value of an output signal from the control device to generate an output which is passed through a filter for providing a modulated output.

REFERENCES:
patent: 3594501 (1971-07-01), Sosin et al.
patent: 3713017 (1973-01-01), Vena
patent: 4090135 (1978-05-01), Farstad et al.
patent: 4368439 (1983-01-01), Shibuya et al.
Anon., "Continuous-Phase Frequency-Shift-Keyed Generator", Computer Design, vol. 16, No. 2, (Feb. 1977), p. 118.
Anon., "Synchronous FSK", Elektor, Jul./Aug. 1980.

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