Device for demodulating signals modulated by frequency-shift key

Details Device for demodulating signals modulated by frequency-shift key Device for demodulating signals modulated by frequency-shift key

1981-08-12

1983-05-03

Moore, David K.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

333193, H03K 300

Patent

active

043822320

ABSTRACT:
A device for demodulating signals modulated by frequency-shift keying comprises a surface-wave filter having two input transducers supplied in parallel by the modulated signals and separated by a given distance, and an output transducer composed of electrodes e.sub.1 to e.sub.n+1 and e'.sub.1 to e'.sub.n+1. The signals delivered by the electrodes e'.sub.1 to e'.sub.n+1 are applied to the inputs of an algebraic summing device through switches I.sub.1 to I.sub.n+1 controlled by logical signals T.sub.1 to T.sub.n+1. The output of the summing device is connected to the output of the demodulating device through a threshold device; programming of the signals T.sub.1 to T.sub.n+1 makes it possible to provide a filter which is matched with the signals to be demodulated.

REFERENCES:
patent: 3522382 (1970-07-01), Ise
patent: 3691464 (1972-09-01), Payton et al.
patent: 3736587 (1973-05-01), Bush et al.
patent: 3835422 (1974-09-01), Hartemann
patent: 3987367 (1976-10-01), Hartemann
Collins et al, "Application of Surface Acoustic Wave Devices to Spread Spectrum Communications", Wave Electronics, vol. 6/76, pp. 311-342.
Morgan et al, "Spread Spectrum Synchronizer Using a Saw Convolver and Recirculation Loop", vol. 64, 5/76, pp. 751-753.
Atzeni et al, "Design of Surface Acoustic Wave Filters", Alta Frequenza, 10/10/74, pp. 601E-865 to 611E-875.

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