FSK Demodulation circuit

Details FSK Demodulation circuit FSK Demodulation circuit

1982-05-07

1985-11-05

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

375 88, 329104, H04L 2714

Patent

active

045518467

ABSTRACT:
A FSK demodulation circuit using counter techniques to distinguish between two transmitted frequencies, provides a delay preceding the change points of the demodulated signal to reduce signal distortion. Presettable counters reduce the number of data bits for processing, and a plurality of counters count an equal plurality of zero-cross intervals to reduce distortion. Registers and multiplexer further reduce circuit complexity.

REFERENCES:
patent: 3715666 (1973-02-01), Mueller et al.
patent: 3846708 (1974-11-01), Franco
patent: 3908169 (1975-09-01), Tong
patent: 3947769 (1976-03-01), Rousos et al.
patent: 4021744 (1977-05-01), Montefusco
patent: 4044202 (1977-08-01), Antoszewski
patent: 4115738 (1978-09-01), Mitarai et al.
patent: 4378526 (1983-03-01), Champagne et al.
"Data Transmission" by Kyoritsu Publishing Company, 1975, pp. 105-131 and 218-221 (Cover identification D.15.8).
W. R. Bennett & J. R. Davey, "Data Transmission", McGraw-Hill Book Co., 1965.
R. W. Lucky, J. Salz & E. J. Weldon, "Principle of Data Communication", McGraw-Hill Book Co., 1968.
John Wiley, 1966, "Phaselock Techniques".

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