See NTSC in Computer
(National TV Standards Committee) The committee that developed the television standards for the U.S, which are also used in Canada, Japan, South Korea and several Central and South American countries. Both the committee and the standard are called "NTSC."
Frames and Resolution
Administered by the FCC, NTSC broadcasts 60 half frames per second, which is known as 60 "fields" per second in TV jargon (59.94 fields per second to be exact). NTSC uses 525 lines of resolution: the first 480 lines in each frame are the image, and the last 45 are the "vertical blanking interval" (VBI), which was designed to give the electron gun time to reposition itself from the bottom of the last frame to the top of the next. See interlace and raster scan.
Color and Audio
NTSC is encoded in the YUV color space, which provides a mathematical equivalent of red, green and blue. It also includes an audio FM frequency and an MTS signal for stereo. See YUV, YIQ, 4fSC, vertical blanking interval, aspect ratio, DTV, PAL and SECAM.
Monochrome to Composite
In 1940 and 1941, the NTSC met to develop the monochrome TV standard, and commercial broadcasting began in the U.S. for black and white TVs on July 1, 1941. The Committee met again from 1950 to 1953 and added a subcarrier frequency to the black and white signal in order to transmit color in a composite signal (see composite video). Color TV began in the U.S. on January 1, 1954.
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