Frequency-shift-keyed data detector

Details Frequency-shift-keyed data detector Frequency-shift-keyed data detector

1984-03-23

1986-02-04

LaRoche, Eugene R.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329110, 375 88, 375 94, H03D 304

Patent

active

045688834

ABSTRACT:
There is disclosed an apparatus and technique for recovering frequency-shift-keyed (FSK) data from a conventional FM detector while allowing the system to operate over wide temperature ranges without FM detector temperature compensation. The FSK input signal is coupled through a bandpass filter and differentiated to provide positive and negative voltage spikes. The voltage spikes are compared with positive and negative reference levels to produce set and reset inputs to a set/reset flip-flop. The output from the flip-flop is a reconstruction of the FSK data which is not affected by temperature-related DC offsets and detector drift.

REFERENCES:
patent: 3257508 (1966-06-01), Crafts et al.

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