- Coder/decoder. A device that converts analog signals to digital to be read by a computer or transmitted over a network, and converts the digital signals back to analog. Sound cards and video cards use this kind of codec. 2. Compression/decompression. A two-step process used on very large multimedia files. Files are compressed to fit on a CD-ROM, then expanded to their original size in order to play them on the computer. MPEG and Indeo are examples of this kind of codec, which may also include analog to digital and digital to analog conversion.
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