High-definition television

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About High-definition television

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High-definition television (HDTV) provides a resolution that is substantially higher than that of standard-definition television. HDTV may be transmitted in various formats: The letter "p" here stands for progressive scan while "i" indicates interlaced. When transmitted at two megapixels per frame, HDTV provides about five times as many pixels as SD (standard-definition television). The term high definition once described a series of television systems originating from the late 1930s; however, these systems were only high definition when compared to earlier systems that were based on mechanical systems with as few as 30 lines of resolution. The on going competition between companies and nations to create true "HDTV" spanned the entire 20th century, as each new system became more HD than the last. The British high-definition TV service started trials in August 1936 and a regular service on 2 November 1936 using both the (mechanical) Baird 240 line and (electronic) Marconi-EMI 405 line (377i) systems. The Baird system was discontinued in February 1937. In 1938 France followed with their own 441-line system, variants of which were also used by a number of other countries. The US NTSC

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