Compression - Compression refers to the reduction of the size of digital data files by removing redundant and/or non-critical information ("data" being the elements of video, audio and other "information"). Digital TV in the U.S. would not be possible without compression.
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.
Component video. This 3-wire convention was created for connecting DVD players to TVs or monitors. It avoids downgrading the signal to NTSC. The signals may be RGB or YPrPb. Some HD STBs have only component video output.
Barn Doors - A term used in television production to describe the effect that occurs when a 4:3 image is viewed on a 16:9 screen. When this happens, viewers see black bars on the sides of the screen or "barn doors."
Sub-channels - OTA DTV stations can show multiple programs simultaneously, subject to the 6 MHz bandwidth limit. This is called multicasting.
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.
Cable card - The Cable Card is the mechanism the industry has adopted to prevent the piracy of cable services. The cable company will periodically mail out new cable cards, ask their customers to plug them into the TV, and then disable the old cards, so anyone without a new cable card would lose service.
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