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. 24, 1976
Filed:
Jun. 09, 1975
Applicant:
Inventor:
Robert Charles Wheeler, Elba, NY (US);
Assignee:
GTE Sylvania Incorporated, Stamford, CT (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04N / ;
U.S. Cl.
CPC ...
178 / ; 178D / ;
Abstract
A circuit for automatically setting the black level in a television receiver includes a comparator circuit coupled to a source of video signals, an adjustable DC potential, and a disabling potential and providing a control signal representative of a video information signal and vertical blanking signal in excess of a threshold level with a detector and limiter providing a DC potential derived from the control signal for setting the black level of a signal available at the video signal source.