SDTV - "Standard Definition Television." SDTV are based on 480 lines of vertical resolution and may have either 4 - 3 or 16 - 9 aspect ratios, and surround sound. Several SDTV programs are sent together to form the simulcast bundle. While SDTV pictures are of significantly better quality than NTSC, they are not up to the standard of HDTV.
Downconvert - The process which reduces the number of pixels in the scanning format used to represent an image, so that it may be reproduced on a display of lower resolution, such as a conventional television. For example, an HDTV image may be downconverted to an SDTV or NTSC image, but in the conversion significant detail information may be lost.
Interactive Television - This is when TV programming features interactive content and enhancements, blending traditional TV viewing with the interactivity of a personal computer.
Screen Aspect Modes - Because both widescreen 16:9 and standard 4:3 programming must co-exist for the foreseeable future, Hitachi has designed a number of screen modes that allow viewers to enjoy both formats.
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.
Data Compression - The process of reducing the size of a data file, usually accomplished through software processing.
Kelvin - A temperature measuring scale used to describe the color of light. The lower the color temperature the redder the light, and the higher the color temperature the bluer the light.
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