Terrestrial Broadcasting - This is a broadcast signal transmitted "over-the-air" to an antenna.
Datacasting - Also known as "enhanced TV." Datacasting is the act of providing enhanced options offered with some digital programming to provide additional program material or non-program related resources. This allows viewers the ability to download data (video, audio, text, graphics, maps, services, etc.) to specially equipped computers, cache boxes, set-top boxes, or DTV receivers.
CRT - An analog vacuum tube technology that has been the mainstay of conventional TV displays for many years, writing the picture on a phosphor coated screen with an electron beam. It can produce bright pictures of excellent resolution but the size and weight of a unit suitable for the large, wide-screen displays needed for HDTV may be, for some, a disadvantage.
TCP/IP - " Transmission Control Protocol/Internet Protocol." TCP/IP is the method most commonly used in the Internet to transfer data, including streaming video and audio, between computers.
Transponder - A satellite channel. There is often one program per transponder. Some transponders are wider than 6 MHz and can carry more than one NTSC program. Several digital channels can fit on one transponder.
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.
SDTV - (standard definition TV) - SDTV is 480i, which is approximately the resolution of NTSC and DVDs.
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