Demodulator for frequency-shift-keyed binary data signals

Details Demodulator for frequency-shift-keyed binary data signals Demodulator for frequency-shift-keyed binary data signals

1982-08-18

1984-10-02

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

371 57, 375 88, H04L 2714

Patent

active

044752199

ABSTRACT:
A frequency-shift-keyed binary data signal demodulator utilizes a reference frequency equal to the arithmetic mean of the two tone frequencies corresponding to the two binary states of an FSK data signal. The frequency-acceptance bands of the FSK signals are varied by variation of the reference frequency. An auxiliary "data valid" signal can be recovered along with the recovered binary data. A demodulator is also disclosed for providing maximum likelihood of detection of an FSK signal having a frequency shift which is a multiple of the bit rate.

REFERENCES:
patent: 3289082 (1966-11-01), Shumate
patent: 4246654 (1981-01-01), Malm
patent: 4254503 (1981-03-01), Vance
patent: 4376309 (1983-03-01), Fenderson et al.

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