MPEG-2 - (Motion Picture Experts Group technical standard 2) - This is a widely used standard for digital encoding of motion pictures. It typically achieves a 50 to 1 compression of data. It achieves this mainly by not retransmitting areas of the screen that have not changed since the previous frame.
Line Doubling - A method used in some televisions to improve the visual quality of an NTSC interlaced picture, making it comparable to a progressively scanned picture.
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.
AC-3 - (see Dolby Digital 5.1)
MMDS - Multichannel, Multipoint Distribution System. A wireless cable system capable of being encoded for pay-per-view and subscriber services.
HDTV - "High-definition Television." This is the most superior video picture available in Digital TV. In the U.S., the 1080i and 720p formats in a 16:9 aspect ratio are the two acceptable HDTV formats. HDTV is a component of DTV.
Toslink - A fiber optic cable standard.
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