Digital frequency-shift keyed demodulator

Details Digital frequency-shift keyed demodulator Digital frequency-shift keyed demodulator

1981-11-20

1984-10-23

LaRoche, Eugene R.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329107, 329 50, 375 82, 375 94, H03D 318

Patent

active

044790929

ABSTRACT:
Asynchronous digital frequency shift keyed (FSK) signals are demodulated by using an autocorrelation type demodulator including digital integration. To this end, the autocorrelation function and digital integration are realized by generating integration increments, i.e., area increments, at the digital signal sampling points and accumulating them to obtain the integrated output. This is realized by turning to account a relationship between zero crossings of the received signal, zero crossings of a delayed version of the received signal and polarity of the product of the received signal and its delayed version relative to sampling points of the received digital signal. Specifically, the area increment in an n.sup.th sampling interval is determined by the time interval since the last zero crossing of the received signal before the n.sup.th sampling point, the time interval since the last zero crossing of the delayed signal before the n.sup.th sampling point and the polarity of the product signal at the n.sup.th sampling point.

REFERENCES:
patent: 4064361 (1977-12-01), Kustka et al.
patent: 4368434 (1983-01-01), Miller et al.
patent: 4388595 (1983-06-01), Brooks
patent: 4412339 (1983-10-01), Alfke et al.

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