Signal components Composite video

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a composite video signal combines on 1 wire video information required recreate color picture, line , frame synchronization pulses. color video signal linear combination of luminance of picture, , modulated subcarrier carries chrominance or color information, combination of hue , saturation. details of encoding process vary between ntsc, pal , secam systems.


the frequency spectrum of modulated color signal overlaps of baseband signal, , separation relies on fact frequency components of baseband signal tend near harmonics of horizontal scanning rate, while color carrier selected odd multiple of half horizontal scanning rate; produces modulated color signal consists of harmonic frequencies fall between harmonics in baseband luma signal, rather both being in separate continuous frequency bands alongside each other in frequency domain. in other words, combination of luma , chroma indeed frequency-division technique, more complex typical frequency-division multiplexing systems 1 used multiplex analog radio stations on both , fm bands.


a gated , filtered signal derived color subcarrier, called burst or colorburst, added horizontal blanking interval of each line, excluding vertical sync interval, synchronizing signal , amplitude reference chrominance signals. burst signal inverted in phase (180° out of phase) reference subcarrier.








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