Frequency demodulator for a FSK data transmission system

Details Frequency demodulator for a FSK data transmission system Frequency demodulator for a FSK data transmission system

1975-06-16

1976-09-14

Kominski, John

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

325320, 328168, 329133, H03D 300

Patent

active

039809617

ABSTRACT:
Frequency demodulator for a frequency-shift-keying data transmission system, which demodulator comprises, in cascade, a monostable circuit, a lowpass filter and a voltage comparator to which a threshold voltage is applied. The demodulator further comprises a switch which is operated by the monostable circuit and supplies to the lowpass filter either one or the other of two voltages derived from the same supply source and having different polarities. The threshold voltage is fixed at zero and in order to correct the bias distortion one of the said two voltages is adjusted.

REFERENCES:
patent: 3303425 (1967-02-01), Pendleton
patent: 3601710 (1971-08-01), Morra
I.B.M. Tech Disc. Bull. "Digital Freq. Shift Key Demod." Dwire et al., vol. 17, No. 6, Nov. 1974.

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