FSK demodulating device

Details FSK demodulating device FSK demodulating device

1988-08-22

1990-01-30

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

375 80, 307358, 329300, H04L 2714

Patent

active

048978574

ABSTRACT:
An FSK shift keying device includes a detector for detecting a transmission frame consisting of a preamble, data, and a postamble, a leading edge detector for detecting a leading edge of a voltage signal detected by the detector, a microprocessor for receiving a detection signal output from the leading edge detector as an interrupt signal, and resetting and restarting a timer, the timer for counting a time lapse in accordance with a clock signal from a clock generator, a sample and hold circuit for holding the voltage signal output from the detector when the time lapse counted by the timer reaches a duration of the preamble, a reference voltage generator for generating a reference voltage signal having an amplitude value which is 1/2 an amplitude value of the voltage signal from the detector, and a comparator for comparing the reference voltage signal with the voltage signal from the sample and hold circuit.

REFERENCES:
patent: 3509279 (1970-04-01), Martin et al.
patent: 3688205 (1972-08-01), Burger
patent: 4596022 (1986-06-01), Stoner

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