Multicasting - Term given to the sharing of the digital television channel among 2, 3, 4 or more individual programs and/or data services
Line Doublers - This device converts NTSC or 480i into 480p. Line doublers with motion-adaptive processing can to an extent turn a 30 frames/sec image into a 60 frames/sec image, thus removing some of the jerkiness and blurriness associated with motion.
Standard Definition TV Format (SDTV) - There are two main digital formats - HDTV and SDTV. SDTV typically does produce better quality images than that of traditional analog TV and pictures somewhat akin to digital cable. However, its images are not nearly as sharp as the images from the ultimate form of digital television _ High-definition TV (HDTV).
NTSC - National Television Systems Committee. The organisation that created the standards for production and broadcasting of analog color television programming in Canada and the United States. The term is widely used to mean a composite analog television signal.
8VSB modulation technique - (8-level vestigial sideband) - DTV stations in the U.S. use 8VSB modulation. This is an AM mode wherein the carrier is multiplied by an 8-level digital signal, and then a filter is used to remove all but the carrier and 6 MHz of the upper sideband. ("8VSB" is often used as a synonym for OTA.)
Fire-wire - (see IEEE 1394)
Progressive Scanning - Some HD televisions use the "progressive" method of scanning, in which the whole picture is transmitted and presented on the screen in one pass. The resulting image is thus remarkably free of flicker and motion artefacts, appearing more "life-like". Some display types, such as LCD, plasma and DLP are inherently of the progressive scan type, while CRT's may be scanned progressively (as in computer monitors) or interlaced.
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