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. This 1-wire standard contains all video information: intensity, color, and sync. The encoding is the same as NTSC, and thus has the "overlapping sideband" problem which sometimes causes wrong colors to appear.
MPEG-2 - (Motion Picture Experts Group technical standard 2) - This is a widely used standard for digital encoding of motion pictures. It typically achieves a 50 to 1 compression of data. It achieves this mainly by not retransmitting areas of the screen that have not changed since the previous frame.
Raster - A group of closely-spaced lines whose brightness changes so as to appear to be an image.
Over-the-air Broadcast (OTA) - Also called Terrestrial Broadcast. The delivery of TV and radio signals, using UHF/VHF frequencies, directly to consumer devices. Broadcasts may be either analog or digital.
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.
Downconvert - The process which reduces the number of pixels in the scanning format used to represent an image, so that it may be reproduced on a display of lower resolution, such as a conventional television. For example, an HDTV image may be downconverted to an SDTV or NTSC image, but in the conversion significant detail information may be lost.
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