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:
Aug. 25, 1992
Filed:
Aug. 31, 1990
Jong-Sang Lim, Suwon, KR;
Dae-Yoon Shim, Seoul, KR;
Samsung Electronics Co., Ltd., Suweon, KR;
Abstract
A circuit for controlling contrast signal is disclosed. The circuit processes contrast signal separately from the original composite video signal and then the pedestal level of the contrast signal is converted to be at zero level. Thereafter, such processed contrast signal is mixed with the original composite video signal. In structure, the contrast control circuit includes: a color/brightness signal separator for separating color signal and brightness signal from said digital composite video signal; a level converter for converting pedestal level of the brightness signal to be at zero level; a gain controller for controlling the output gain of the level converter; a delay controller for delaying the brightness signal output from the color/brightness signal separator; a mixer for mixing the outputs of the delay controller and the gain controller; and an overflow detection and output section for detecting an overflow from the output of said mixer so that if the overflow is detected, the overflow detection value is restricted to a maximum value.