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This blanking interval was originally designed to simply blank the receiver's CRT to allow for the simple analog circuits and slow vertical retrace of early TV receivers.However, some of these lines may now contain other data such as closed captioning and vertical interval timecode (VITC).

The NTSC selected 525 scan lines as a compromise between RCA's 441-scan line standard (already being used by RCA's NBC TV network) and Philco's and Du Mont's desire to increase the number of scan lines to between 605 and 800.Most US NTSC broadcasters were required by the FCC to shut down their analog transmitters in 2009.Low-power stations, Class A stations and translators were required to shut down by 2015.The National Television System Committee was established in 1940 by the United States Federal Communications Commission (FCC) to resolve the conflicts that were made between companies over the introduction of a nationwide analog television system in the United States.In March 1941, the committee issued a technical standard for black-and-white television that built upon a 1936 recommendation made by the Radio Manufacturers Association (RMA).is the analog television system that is used in North America, and until digital conversion was used in most of the Americas (except Brazil, Argentina, Paraguay, Uruguay, and French Guiana); Myanmar; South Korea; Taiwan; Philippines, Japan; and some Pacific island nations and territories (see map).

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