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:
Jun. 07, 1983
Filed:
Sep. 25, 1981
John G Henderson, Princeton, NJ (US);
Robert J Maturo, Bricktown, NJ (US);
RCA Corporation, New York, NY (US);
Abstract
In a sweep type tuning system capable of sweeping through a desired range of carrier frequencies selectively in one of two directions, a carrier detector includes a discriminator for generating a discriminator signal as the frequency range is swept which has a first amplitude portion when the frequency of a tuned carrier is less than a predetermined nominal value and a second amplitude portion when the frequency of the tuned carrier is greater than the predetermined nominal value. A sequence detector determines the sequence of generation of the first and second portions of the discriminator signal to generate a signal indicating the presence of the tuned carrier. The presence indicating signal is generated when the sweeping takes place in a first direction if the first and then the second portions are sequentially generated and when the sweeping takes place in the second direction if the second and then first portion are sequentially generated.