NTSC

NTSC is the analog television system in use in Japan, United States and certain other places, mostly in the Americas (see map). It is named for the National Television System(s) Committee, the industry-wide standardization body that created it.

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The National Television System Committee was established in 1940 by the Federal Communications Commission (FCC) to resolve the conflicts which had arisen between companies over the introduction of a nationwide analog television system in the U.S. The committee in March 1941 issued a technical standard for black and white television. This built upon a 1936 recommendation made by the Radio Manufacturers Association (RMA) that used 441 lines. With the advancement of the vestigial sideband technique for broadcasting that increased available bandwidth, there was an opportunity to increase the image resolution. The NTSC compromised between RCA's desire to keep a 441-line standard (their NBC TV network was already using it) and Philco's desire to increase it to between 600 and 800, settling on a 525-line transmission. Other technical standards in the final recommendation were an image rate of 30 frames per second interlaced 2 to 1, an aspect ratio of 4 by 3, and frequency modulation for the sound signal.

Analog television: Analog television encodes television picture information as an analog signal, that is, by varying the voltages and/or frequencies of the signal. All systems preceding digital television can be considered analog....

Japan: For other uses, see Japan (disambiguation)....

United States: :For other uses, see US (disambiguation), USA (disambiguation), and United States (disambiguation)....