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:
Jul. 17, 1990
Filed:
Jul. 27, 1989
Takashi Chikuma, Kanagawa, JP;
Ichiro Tsutsui, Tokyo, JP;
Sony Corporation, Tokyo, JP;
Abstract
A blanking circuit for use in a television receiver designed for video signals of both the HDTV and double-speed scanning NTSC systems comprises a sawtooth generator, a reference voltage generator, a comparator for comparing the sawtooth signal with the reference voltage, a switch for selectively changing the relative level of the reference voltage and the sawtooth signal in conformity with the input broadcasting system, and with the output of the comparator supplied as a blanking pulse to a video signal processor. Due to selective change of the time constant of the sawtooth generator or the change of the threshold level of the reference voltage, a proper blanking pulse can be produced with high precision to prevent losing the image on the monitor CRT screen, and an adequate blanking interval is exactly obtained.