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:
Mar. 28, 1989
Filed:
Apr. 13, 1987
Petrus W Welles, Eindhoven, NL;
U.S. Philips Corporation, New York, NY (US);
Abstract
A television synchronizing signal pattern correction circuit has a change-over switch (23) which can supply a vertical synchronizing signal (V') obtained from an input (13) or from an output (17) of a delay circuit (15). The change-over switch (23) is operated by a signal obtained from an output (31) of a simple measuring circuit (9). With the aid of two pairs of D-flipflops (35, 37; 39, 41), two exclusive-OR gates (43, 45), two AND-gates (47, 49) and a JK-flipflop (52) the measuring circuit (9) measures the mutual location of undelayed (at 11) and delayed (at 19) vertical synchronizing signals with respect to a signal (at 7) having a duty cycle of fifty percent and representing the horizontal synchronizing signals. As a result, unwanted irregularities in the selected vertical synchronizing signal can be avoided, thus making it usable for, inter alia, the synchronization of writing into a field memory.