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. 17, 1987
Filed:
Dec. 24, 1984
Applicant:
Inventor:
Charles L Olson, Camden County, NJ (US);
Assignee:
RCA Corporation, Princeton, NJ (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04N / ;
U.S. Cl.
CPC ...
358164 ; 358 32 ; 358169 ; 307491 ; 307494 ; 307497 ; 307501 ; 328142 ; 330253 ; 330254 ; 330260 ;
Abstract
A gamma corrector for a video signal includes a first amplifier, a nonlinear signal translating stage and a second amplifier coupled in cascade in the order named. A feedback network coupled between the output of the second amplifier and a gain-control input of the first amplifier derives a gain-control signal indicative of the white level of the video signal produced at the output of the second amplifier. A gamma control signal is applied to a gain control input of the second amplifier in one embodiment and to a black level clamp associated with the first amplifier stage in another embodiment.