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. 17, 1977
Filed:
Aug. 14, 1975
Robert Adams Dischert, Burlington, NJ (US);
James Morgan Walter, Collingswood, NJ (US);
RCA Corporation, New York, NY (US);
Abstract
A synchronizing system separates the synchronizing components from a composite video signal into signal components representing horizontal sync and color burst. The leading edge of the horizontal sync component is used to develop a timing signal which is compared with the positive and negative averaged burst signal from a band pass filter tuned to the burst frequency. Comparators drive respective flip-flops arranged to provide both negative and positive burst signal outputs at a selected burst signal crossover near the end of the original burst signal. A gate circuit coupled to the flip-flop output terminals develops a line start signal which contains the leading edge of the incoming signal sync information corrected to a selected color burst. The synchronizing circuit also provides a substitute signal in the absence of the color burst component to maintain system synchronization.