SECAM broadcasting standards
SECAM (Sequentiel couleur a memoire, French for "Sequential Color with Memory") - is an analog color television system first used in France. Just as with the other color standards adopted for broadcast usage over the world, SECAM is a compatible standard, which means that monochrome television receivers predating its introduction are still able to show the programs. Because of this compatibility requirement, color standards add a second signal to the basic monochrome signal, and this signal carries the color information, called chrominance or C in short, while the black and white information is called the luminance (Y in short). Old TV receivers only display the luminance, while color receivers process both signals.
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