FSK modulation using switched outputs of two oscillators

Details FSK modulation using switched outputs of two oscillators FSK modulation using switched outputs of two oscillators

1984-04-16

1985-09-24

Grimm, Siegfried H.

Modulators

Amplitude modulator

Nonlinear device controlled by modulating signal

331 25, 331 49, 331116R, 375 66, 332 19, H04L 2712

Patent

active

045435413

ABSTRACT:
Two oscillators are utilized to convert digital data into an FSK modulated signal. One oscillator is at the mark frequency and the other is at the space frequency. FSK modulation is accomplished by switching between the two frequencies based on the state of the digital data. Phase and frequency shifting techniques are also provided to insure that a desired difference between the mark frequency and space frequency is maintained and to also insure that a proper phase relationship is maintained between the output from the two oscillators.

REFERENCES:
patent: 2491387 (1949-12-01), Miller
patent: 2494321 (1950-01-01), Usselman
patent: 2568408 (1951-09-01), Peterson
patent: 2866161 (1958-12-01), Davidoff
patent: 2927159 (1960-03-01), Bannister et al.
patent: 3032611 (1962-05-01), Montgomery
patent: 3899746 (1975-08-01), Gammel
patent: 4105948 (1978-08-01), Wolkstein

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