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After the invention of the DVD in 1997, and later the Blu-ray Disc in 2006, sales of videotape and recording equipment plummeted. See also: Digital television and Video coding formatĭigital video is capable of higher quality and, eventually, a much lower cost than earlier analog technology. However, prices gradually dropped over the years in 1971, Sony began selling videocassette recorder (VCR) decks and tapes into the consumer market. Video recorders were sold for US$50,000 in 1956, and videotapes cost US$300 per one-hour reel. In 1951, the first VTR captured live images from television cameras by writing the camera's electrical signal onto magnetic videotape. Charles Ginsburg led an Ampex research team developing one of the first practical video tape recorders (VTR). Video was originally exclusively a live technology. Video technology was first developed for mechanical television systems, which were quickly replaced by cathode-ray tube (CRT) television systems. Video, by contrast, encodes images with electromagnetic waves. Video was invented decades after film, which records a sequence of miniature images visible to the eye when the film is physically examined. See also: Analog television and Videotape NTSC composite video signal (analog)

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