HDTV - High Definition Television - HDTV is a TV system having approximately twice the vertical and horizontal picture resolution of today's NTSC TV and having a wide aspect ratio of 16 - 9. Two HDTV formats are currently in use; (a) 1920 pixels per line and 1080i lines per frame and (b) 1280 pixels per line and 720p lines per frame. HDTV can be recognised by its spectacular picture resolution, freedom from annoying artefacts and impressive 5.1 channel surround sound.
DVD - Digital Versatile Disk. An optical recording media similar to the familiar CD but having seven times its capacity on a single side. In television applications, DVD's are capable of carrying full-length commercial movies, plus additional material such as outtakes, director's notes, movie trailers, etc.
Computer Input - Some HDTV sets have an input like SVGA or VGA that allows the TV sets to be connected to computers.
Luminance - Component of the video signal that represents the brightness of the image.
Progressive Scanning - A system of video scanning where lines of a picture are displayed consecutively (unlike interlaced).
Pixel - A picture element; a single displayable video dot. HDTV requires from 1 to 2 million pixels in the display for full resolution images to be shown.
PAL - (Phase Altering Line standard) - This alternative to NTSC has 625 lines, interlaced, 50 fields per second. It is used in most of Europe, Asia (except USSR), Africa, and Australia, and parts of South America.
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