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. 31, 1988
Filed:
Sep. 18, 1987
Wouter Smeulers, Eindhoven, NL;
Paulus J Hovens, Eindhoven, NL;
U.S. Philips Corporation, New York, NY (US);
Abstract
A synchronizing circuit and a sawtooth generator for the field deflection in a picture display device in which the sawtooth-shaped signal generated by the sawtooth generator has a retrace whose duration is switchable between a short and a longer duration. In a first use this switchover is used for eliminating the interlacing upon reception of interlaced signals, while the difference between the two durations is equal to half a line period and the switchover is effected at the picture frequency. In a second use a memory circuit is used which is an auxiliary circuit for the field synchronization, in which the shorter duration of the retrace period is switched over to in the absence of a plurality of successive incoming field synchronizing pulses, which plurality is not higher than a predetermined value.