Initials for the National Television System Committee (USA, also stands for 'Never Twice the Same Colour’.

  1. The 'NTSC-Committe I’ during 1941 established the 525line / 60Hz 2:1 interlaced monochrome television in the U.S.
  1. The NTSC- Committee II during 1953 established the 525line / 59.94Hz 2:1 interlaced composite color format television in the U.S. with two color-difference signals [labeled / and Q ] quadrature-modulated onto a color subcarrier, and added to the luminance signal.
  1. 'NTSC’ is often used as the convenient name for the current North American television system. PAL is used in Australia

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1964, SMPTE Nomenclature for Motion Picture Film used in Studios and Processing Laboratories, Society of Motion Picture and Television Engineers, USA SMPTE Glossary http://www.smpte.org/home/