Frequency shift keying signal for a demodulator

Details Frequency shift keying signal for a demodulator Frequency shift keying signal for a demodulator

1985-07-12

1986-10-07

LaRoche, Eugene R.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329110, 375 88, H03D 304

Patent

active

046161872

ABSTRACT:
A frequency shift keying signal in analog form alternatively includes a mark frequency, f.sub.m, and a space frequency, f.sub.s. Demodulation of the frequency shift keying signal is achieved in a digital circuit utilizing a clock and first and second counters. Each counter may have a count N. The clock produces pulses with a frequency of 2Nf.sub.c ; where N is the count of the counters, and f.sub.c is a frequency intermediate the mark frequency, f.sub.m, and the space frequency, f.sub.s. Associated digital circuitry permits the first counter to produce an output indicative of the presence of the mark frequency only when the first counter has continuously counted N clock pulses. Further digital circuitry permits the second counter to count only intermittently, and a reset circuit resets the second counter before it can produce a high output signal when the mark frequency is present in the frequency.

REFERENCES:
patent: 3614639 (1971-10-01), Belman
patent: 3979685 (1976-09-01), Motley et al.

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