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. 29, 1994
Filed:
Feb. 14, 1992
Hideaki Sadamatsu, Hirakata, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A tone correction circuit for a luminance signal which can provide several shapes of correction characteristics. The tone correction circuit comprises a circuit in which the current increases at a first specified voltage or higher and decreases at a second specified voltage or higher so that the current is outputted in a specified range and also provided is a circuit which serves to increase the current at the second specified voltage or higher. Thus, without changing the output voltage at the midpoint, the correction amounts at the minimum point and midpoint, the shifting amount of the midpoint, the correction amounts from to the maximum point and the correction amount at the maximum point, can be controlled so that an optimum output waveform can be obtained in accordance with a scene, and particularly, fuzzy control for the scene can be efficiently made.