FSK demodulating device

Details FSK demodulating device FSK demodulating device

1988-08-22

1990-03-20

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375 88, 307358, H04L 2714

Patent

active

049107534

ABSTRACT:
An FSK shift keying device includes a detector for detecting a transmission frame consisting of a preamble, data, and a postamble, a time constant circuit charged in response to a voltage signal detected by the detector for generating a time constant, a charging voltage being determined in accordance with the time constant set in correspondence with a duration of high level in the preamble of the transmission frame, 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 further generating a comparison reference voltage signal obtained by subtracting the reference voltage from the charging voltage, and a comparator for comparing the comparison reference voltage signal with the voltage signal input from the detector.

REFERENCES:
patent: 3509279 (1970-04-01), Martin et al.
patent: 3688205 (1972-08-01), Burger
patent: 4263520 (1981-04-01), Kajihata et al.
patent: 4596022 (1986-06-01), Stoner

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