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:
May. 10, 1977
Filed:
Sep. 24, 1975
Heinz Hess, Weiterstadt, DT;
Robert Bosch G.m.b.H., Stuttgart, DT;
Abstract
The red, green and blue color signals are, respectively, applied to the base of three transistors, each connected as a common emitter stage. A constant current source has an output terminal connected to that side of the emitter resistors not connected to the respective emitter. The conductivity of the emitter resistors is proportional to the coefficients in the equation Y=k1.sup.. R+k2.sup.. G+k3.sup.. B where Y is the luminance signal. For the system, the color difference signals are then derived from the collector of the emitter follower stage receiving the red and green signals and the luminance signal is derived at the constant current output terminal. For the NTSC system, the same signals are derived from the same terminals, but an additional coupling resistor is added between the emitter of the transistor receiving the blue signal and the other two emitters.