FTA - (Free To All MPEG-2 broadcasts) - The two most common digital schemes found on C-band and Ku band are 4DTV and FTA. FTA receivers are available to consumers, but there is effectively no regular HD programming.
Codec - This term is short for "Coder-decoder." A codec is a device that converts analog video and audio signals into a digital format for transmission. It also converts received digital signals back into an analog format.
Composite Video - An analog video signal (NTSC, PAL or SECAM) that includes both luminance (brightness) and chrominance (color) signals encoded together to form a single signal.
Terrestrial - A broadcast signal transmitted "over the air" to an antenna.
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.
Raster - A group of closely-spaced lines whose brightness changes so as to appear to be an image.
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.
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