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:
Oct. 20, 1981
Filed:
Jul. 28, 1980
Christopher M Engel, Arlington Heights, IL (US);
Gopal K Srivastava, Buffalo Grove, IL (US);
Zenith Radio Corporation, Glenview, IL (US);
Abstract
A dynamic enabling network is described for turning off and on a color correction network in a color television receiver. The enabling network receives and combines selected color-difference signals which are superimposed on a D.C. bias level so as to generate a first control signal whose amplitude is near a maximum when the color-difference signals are representative of fleshtone hues. A second control signal, also derived from the selected color-difference signals, is a D.C. signal whose amplitude is a function of the D.C. bias level associated with the selected color-difference signals. Both control signals are applied to a comparator for turning on the color correction circuit only when the difference in amplitude between the two control signals is indicative of hues within a selected range of fleshtones.