Advanced compatible television (actv)
Advanced compatible television (actv) an extended definition television system that can operate with existing bandwidths on ex- isting receivers and is compatible with the ntsc broadcasting system. The actv system was proposed by the advanced television research consortium and was the first high definition television (hdtv) system. Hdtv system was tested by the fcc july 17, 1992. The additional picture information needed to increase the picture width and to increase the resolution to the hdtv format is transmitted in an augmented channel as an alternative to simulcast transmission. See advanced television research consortium.
Source: http://ee.sharif.edu/~lcsl/useful/Electrical%20Engineering%20Dictionary.pdf
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Author of the text: Ed. P.A. Laplante Boca Raton: CRC Press LLC, 2000
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