Coherent frequency shift key demodulator

Details Coherent frequency shift key demodulator Coherent frequency shift key demodulator

1978-11-15

1980-11-18

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329122, 329124, 375 91, 375120, H04L 2714

Patent

active

042348528

ABSTRACT:
Disclosed is a frequency shift key demodulator for the coherent detection of both mark and space tones. Cross coupled phase locked loops lock onto and track the difference in frequency between translated mark and space tones. An additional set of cross coupled phase locked loops locks onto and tracks overall frequency drift of the mark and space tones. Signals are generated within the first set of cross coupled loops allowing for coherent detection thereby permitting detection during signal to noise ratios of less than one. Loop bandwidths can be independently controlled and are independent of the data rate thus permitting wide system flexibility.

REFERENCES:
patent: 3743775 (1973-07-01), Hutchinson et al.
patent: 4072905 (1978-02-01), Keelty

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