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:
Jan. 17, 2006
Filed:
Dec. 29, 1997
Robert Dale Altmanshofer, Carmel, IN (US);
William Adamson Lagoni, Indianapolis, IN (US);
Robert Dale Altmanshofer, Carmel, IN (US);
William Adamson Lagoni, Indianapolis, IN (US);
Thomson Licensing, Boulogne, FR;
Abstract
A color television receiver system processes color difference signals for providing tint control while maintaining uniform color amplitude with respect to changes in hue shift angle. The color difference signals are modified as a function of each other and as a function of a hue shift angle to produce modified color difference signals. A color difference signal [B-Y] is supplied as a first input to multipliers Mand M. Another color difference signal [R-Y] is supplied as a first input to another pair of multipliers Mand M. A control signal generator produces output signals sin θ and cos θ where θ is the hue shift angle. The sin θ signal is supplied as a second input to multipliers Mand Mwhile the cos θ signal is supplied as a second input to multipliers Mand M. The outputs of Mand Mare added in an adder Ato produce a modified output [R-Y]'. Similarly, the output of multiplier Mis provided as a positive input to adder Awhereas the output of multiplier Mis provided as a negative input to adder Ato produce a modified color difference signal [B-Y]′. The modified color difference signals [R-Y]′ and [B-Y]′ represent a color vector having an amplitude A that remains substantially constant over a relatively wide range of hue shift angles θ.