5.1 channel - This is 6 channel audio. The 6th channel (the sub-woofer) has reduced bandwidth.
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.
GLV - (Grating Light Valve) - This is another contender to replace CRTs in projection TVs.
MMDS - Multichannel, Multipoint Distribution System. A wireless cable system capable of being encoded for pay-per-view and subscriber services.
Native format - Some DTVs will convert the 18 ATSC formats into 1 or 2 formats and will draw only those. For these sets, the `native' format is - 1. the formats the set will draw or - 2. the original format. (These are contradictory definitions, but they reflect current practice. 1 is probably the preferred meaning.)
Analog Video - The conventional NTSC television system in use today uses analog technology, in which the image sound and the picture brightness and color are represented by signals proportional to these values. The values of these signals are vulnerable to interference and noise. Digital television overcomes this vulnerability and delivers signals that are totally clean.
OTA - (over the air) - There are about 1500 OTA (terrestrial) TV stations in the U.S.
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