well kajol, Although VHS video format is the same throughout the World, the video standard or electronic signal that is recorded on the cassette varies from country to country. The two most common video standards used are NTSC and PAL.
NTSC is the video system or standard used in North America and most of South America. In NTSC, 30 frames are transmitted each second. Each frame is made up of 525 individual scan lines.
PAL is the predominant video system or standard mostly used overseas. In PAL, 25 frames are transmitted each second. Each frame is made up of 625 individual scan lines.
NTSC is the analog television system in use in the United States, Canada, Japan, Mexico, the Philippines, South Korea, Taiwan, and some other countries (see map). It is named for the National Television System Committee, the U.S. standardization body that adopted it. . The first black-and-white NTSC standard for broadcast was developed prior to the Second World War and had no provision for color transmissions. The standard called for 525 lines of picture information in each frame, and 30 frames per second; the frame rate was later slightly adjusted for the color standard. Civilian development of commercial television was halted with the entry of the United States into the war. In 1953 a second standard was issued, which allowed color broadcasting to be compatible with the existing stock of black-and-white receivers, while maintaining the broadcast channel bandwidth already in use. This was an important commercial advantage over incompatible color systems that had also been proposed. NTSC was the first widely adopted broadcast color system. After over a half-century of use, over-the-air NTSC transmissions will be replaced with ATSC in the United States in 2009. Various digital television systems have replaced the vacuum-tube era standard.
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4:16 PM on May 01, 2008
