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:
Oct. 23, 1984
Filed:
Nov. 05, 1981
Michel Geesen, Antony, FR;
Jacques Mourant, Maurepas, FR;
Daniel P Ludwig, Ramonville-Saint-Agne, FR;
Electronique Marcel Dassault, Paris, FR;
Centre National d'Etudes Spatiales, Paris, FR;
Abstract
An apparatus for receiving messages transmitted from a plurality of radio signal sources operating at different frequencies within a predetermined frequency band. Means are provided to frequency scan the receive signals, deriving information for determining the frequency range in which said signals lie. A demodulating phase locked loop is connected to receive the radio frequency signals, and an initial operating frequency for the phase locked loop is provided by the frequency range information determined from the means for frequency scanning. A resetting circuit is included to maintain the phase locked loop oscillator frequency at a value independent of the frequency of the radio signals.