FSK Demodulator utilizing multiple-phase reference frequencies

Details FSK Demodulator utilizing multiple-phase reference frequencies FSK Demodulator utilizing multiple-phase reference frequencies

1982-11-29

1985-07-16

LaRoche, Eugene R.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329126, 375 82, 375 88, H03D 306

Patent

active

045299412

ABSTRACT:
FSK demodulator apparatus in accordance with the teachings of the present invention is provided wherein the input signal to be demodulated is phase compared with a plurality of reference phases of the mark and space frequencies to be detected to bracket the input signal within a particular quadrant for the frequency involved. The results of each phase comparison are then integrated with respect to time and threshold compared in such a manner that one or more phase comparison outputs, each having a duty cycle not equal to 50%, will be produced for the frequency involved, resulting in an output from the threshold comparison. This output may then be employed to establish a logic condition indicative of the frequency then being received.

REFERENCES:
patent: 3555428 (1971-01-01), Perreault
patent: 4247943 (1981-01-01), Malm
patent: 4290140 (1981-09-01), Malm
patent: 4322851 (1982-03-01), Vance
Torrey, W. "Linear Phase Detector With Digital Circuits", IBM Tech. Disclosure Bulletin, v. 15, No. 12 (May 1973), pp. 3862-3863.

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