Sensitive demodulator for frequency shift keyed carrier signals

Details Sensitive demodulator for frequency shift keyed carrier signals Sensitive demodulator for frequency shift keyed carrier signals

1980-04-04

1982-06-15

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329110, 375 88, H03D 300

Patent

active

043353541

ABSTRACT:
A demodulator for frequency shift keyed carrier signals is described. A conditioned F.S.K. signal is simultaneously fed to a pair of rising edge triggered single shot voltage generators, such carrier signal being inverted prior to being fed to one of such single shots. The single shots are each triggered upon receipt of a cycle edge to initiate an output pulse having a duration falling between the time intervals distinctive of the cycles of the two possible carrier signal frequencies. The next rising edge received by each causes the respective single shots to retrigger, and latches the previous output of each into the first element of an associated serial memory device. The successive elements of each of the serial memory devices, store the state output signals of adjacent cycles of the carrier signal, with the states in one of such devices being one-half cycle apart from the states in the other. The outputs of all the elements of the two serial storage devices are connected to corresponding inputs of a majority logic gate, and such elements are triggered simultaneously to furnish output signals to such majority logic gate upon receipt of a carrier signal rising edge. The result is that the majority logic gate produces a demodulated digital output signal which is representative of the digital states of a majority of the carrier signal cycles examined.

REFERENCES:
patent: 3437932 (1969-04-01), Malakoff
patent: 3474341 (1969-10-01), Crafts et al.

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