The composite video synchronous signal carries the luminance (typically referred to as black-and-white television) information of a television picture. To include color in the video signal, additional chrominance information needs to be overlaid. In North America, the U.S. National Television System Committee in 1947 introduced the standard that is now commonly known by the organization’s abbreviation, NTSC. NTSC also includes an I/Q-modulated color subcarrier at a frequency of 3.579545 MHz, where the two color-difference signals, U and V, can be found. Unlike PAL, the NTSC standard does not apply phase shifting linewise. Therefore, a common problem is the display of incorrect color due to phase errors. The combination of luminance and chrominance information yields the composite color video signal (CCVS). The NTSC standard is used in the USA, Canada, South Korea and other countries.
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