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. 01, 1991
Filed:
Sep. 21, 1990
Gerhard Pletz-Kirsch, Hamburg, DE;
U.S. Philips Corporation, New York, NY (US);
Abstract
In a digital circuit for detecting horizontal or vertical synchronizing pulses in a digital video signal, the video signal is applied to a level detector which supplies an extreme value signal which indicates the level of the synchronizing pulse at the end of a time interval. The extreme value signal represents the extreme value of the signal which has hitherto occurred in a time interval equal the time between two consecutive synchronizing pulses. In each period between two consecutive synchronizing pulses a new time interval is started at a predetermined instant outside the blanking interval. In order to generate a comparison signal, the extreme value signal is continuously reduced by a predetermined amount. The comparison signal and the digital video signal delayed by several sample clock periods are applied to a comparator which supplies a synchronizing signal during those periods when amplitude level of the delayed digital video signal is higher than the level of the comparison signal.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile