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:
Sep. 06, 1983
Filed:
Aug. 13, 1980
Takashi Okada, Kangawa, JP;
Atsushi Matsuzaki, Kangawa, JP;
Sony Corporation, Tokyo, JP;
Abstract
A video signal processing circuit is disclosed which has a wave-forming circuit for setting the level of an input video signal to a predetermined first D.C. level, which is higher than the pedestal level of the input video signal, at least during the blanking period of the input video signal, and producing a wave-formed signal; a peak-hold circuit for detecting and holding the level of the darkest peak of the wave-formed signal and producing a peak-hold output signal; and a black level control circuit controlled by the peak-hold output signal for controlling the D.C. level of the input video signal so that the darkest level of the input video signal coincides with a predetermined second D.C. level.