RGB concept

from Wikipedia, the free encyclopedia
RGB output stages in a Telefunken PALcromat tube color television, approx. 1967

The RGB concept describes a method of color signal processing that has been used in the devices of all three color television systems NTSC , PAL and SECAM since the mid-1960s .

In this case, the TV from the video portion will be in color and monochrome signal ( luminance signal Y) and color difference signals , the color signals R ot, G reen and B generated lukewarm. These are amplified in the three separate broadband video output stages for red, green and blue in order to be fed to the three cathodes of the color picture tube . In contrast to the older color difference concept , the black and white signal is no longer directly on the color picture tube. The only thing that is applied to the Wehnelt cylinder is a DC or, if necessary, control voltage, with which the gray and white tone control is kept constant.

Since the characteristics of the cathodes of a color picture tube are somewhat kinked in the lower area, while they increase largely linearly in the middle and upper area, the RGB concept enables better reproduction of pastel colors in dark areas of the picture than the color difference concept.

literature

  • H. Achterberg et al. (1967): VALVO color television. Receiver circuits. Published by VALVO GmbH.
  • Dieter Nührmann (1967): color television book. Color television technology based on the NTSC-PAL system. Stuttgart.
  • Gunnar Zaydowicz (undated): Color television. Part 2: the recipient. Minden.
  • WA Holm (1964): Color television technology without mathematics. Philips technical library. Eindhoven.
  • Otto Ackermann (1972): Television in Colors. Leipzig.

Web links