Frequency shift keyed toned generator

Details Frequency shift keyed toned generator Frequency shift keyed toned generator

1975-11-03

1977-03-29

Kominski, John

Oscillators

With frequency adjusting means

Step-frequency change

328 24, 328127, 330109, 331 49, 331 51, 332 26, H03C 306

Patent

active

040152200

ABSTRACT:
A frequency shift keyed (FSK) generator producing an output frequency which is determined by gating through a selected one of a plurality of crystal controlled oscillators. The oscillator output is divided by a digital frequency divider to the operating tone frequency. The square wave output of the divider is filtered to a sinewave by an active tracking bandpass filter which is instantaneously switched to the operating frequency simultaneously with the selection of the appropriate crystal controlled oscillator.

REFERENCES:
patent: 3028551 (1962-04-01), Secretan
patent: 3529260 (1970-09-01), Noyes, Jr.
patent: 3719897 (1973-03-01), Tarr
patent: 3752922 (1973-08-01), Burke
patent: 3760289 (1973-09-01), Hurtig

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