OTA - (over the air) - There are about 1500 OTA (terrestrial) TV stations in the U.S.
Line Doubling - A method used in some televisions to improve the visual quality of an NTSC interlaced picture, making it comparable to a progressively scanned picture.
NTSC - (National Television System Committee technical standard) - This is analog TV invented in 1946. NTSC has 525 lines (483 visible) interlaced, 60 fields per second. This standard is in use in North America, Japan, South Korea, Burma, Taiwan, the Philippines, and much of South America.
Multicasting - Term given to the sharing of the digital television channel among 2, 3, 4 or more individual programs and/or data services
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."
Pan-and-scan - A method of broadcasting a wide screen film on a 4:3 channel. Most of the time just the center of the image is shown. (The right and left edges are clipped off.)
Interactive Television - TV programming with interactive content and enhancements, blending traditional TV viewing with the interactivity of a personal computer.
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