YPrPb - Color representation requires three independent variables. CRTs - prefer red, green, and blue. Ink jet printers prefer yellow, magenta, and cyan. NTSC encodes color as luminance (brightness), hue (color), and saturation (absence of white in colors). Storage media such as DVDs prefer Y, Pr, and Pb, where Y is luminance, Pr is Y-red, and Pb is Y-blue. This is because Pr and Pb can be at lower resolution and not degrade the image noticeably, thus saving storage space.
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.)
Letterbox - The full display of a wide aspect ratio 16 - 9 picture on a display of aspect ratio 4 - 3 will result in black bars above and below the picture. This arrangement is referred to as "Letterbox" and is often seen during movies shown on television.
Channel - A 6 MHz (bandwidth) section of spectrum for over-the-air broadcast (channels 2 - 69) or in TV cable that carries one analog NTSC program or one or more DTV programs.
CDTV - Canadian Digital Television, a not-for-profit, government-approved body, with members from all sectors of the TV industry. CDTV is mandated to advise its members, Industry Canada and the CRTC on the roll out of DTV in Canada.
Decoder - See "codec." A device or program that translates encoded data into its original format (i.e., it decodes the data.)
LCD - (Liquid Crystal Display) - A common display technology. LCD is likely to replace CRTs in the smallest HDTV's.
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