Digital frequency shift key modulator

Details Digital frequency shift key modulator Digital frequency shift key modulator

1974-09-18

1976-11-09

Grimm, Siegfried H.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

332 11R, 178 66R, 179 2DP, 325 30, 325163, H04L 2712

Patent

active

039913899

ABSTRACT:
A frequency shift key modulator producing sine wave output signals of different frequencies for mark (1) and space (0) signal levels on an input "send data" lead including a counter which divides the frequency of an input oscillator by different denominators for the mark and space signals and the output of which is synthesized to produce a stepped output approximating a sine wave and a final filter for smoothing the steps out of the output. In cases in which the mark and space output frequencies are approximately in the ratio of 1 to 2, a frequency divider is used for the mark output frequencies.

REFERENCES:
patent: 3600680 (1971-08-01), Maniere et al.
patent: 3659048 (1972-04-01), Zuerblis et al.
patent: 3668562 (1972-06-01), Fritkin
patent: 3713017 (1973-01-01), Vena
patent: 3773975 (1973-11-01), Koziol
patent: 3787785 (1974-01-01), Bass

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