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:
Apr. 11, 1989
Filed:
Aug. 03, 1987
Wouter Smeulers, Eindhoven, NL;
U.S. Philips Corporation, New York, NY (US);
Abstract
A circuit for deriving a synchronizing signal contained in an incoming video signal, having a pulse generator generating the synchronizing signal when the incoming signal reaches a threshold value. This treshold value corresponds to a level located between the peak and reference levels of the incoming signal and is determined with the aid of a keyed integrator, which integrates the video signal during a period of time which at least partly coincides with the occurrence of an incoming line synchronizing pulse and during a period of time after this occurrence, but before the end of the line blanking interval. In the synchronized state of the line synchronizing circuit, the required keying pulses are generated by this line synchronizing circuit; in the non-synchronized state the keying pulses are derived from the delayed output signal of the pulse generator. (FIG. 2).