Frequency shift keyed tone generator

Details Frequency shift keyed tone generator Frequency shift keyed tone generator

H - Electricity

03

B

331/11, 379/22,

H03B 21/00 (2006.01) H04L 27/12 (2006.01)

Patent

CA 1052872

Abstract of The Disclosure 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.

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