Frequency shift keyed tone generator

Details Frequency shift keyed tone generator Frequency shift keyed tone generator

1977-01-05

1979-07-03

Griffin, Robert L.

Telegraphy

Systems

Alternating or pulsating current

325163, H04B 104

Patent

active

041601211

ABSTRACT:
A frequency shift keyed (FSK) generator producing an output tone frequency which is determined by the output frequency of a digital frequency synthesizer responsive to a control signal. The square wave output of the synthesizer is filtered to a sinewave by an active tracking bandpass filter whose operating frequency is automatically switched to the output frequency of the synthesizer.

REFERENCES:
patent: 3249896 (1966-05-01), Baker
patent: 3395351 (1968-07-01), Diese
patent: 3560881 (1971-02-01), Fredricson
patent: 3729688 (1973-04-01), Cerny
patent: 3760301 (1973-09-01), Goransson
patent: 3826999 (1974-07-01), Williford
patent: 3932704 (1976-01-01), Bodony
patent: 3997855 (1976-12-01), Nash
patent: 4039952 (1977-08-01), Huntley

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