The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 03, 1983
Filed:
Aug. 12, 1981
Pierre Laurent, Paris, FR;
Thomson-CSF, Paris, FR;
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.