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A codec is a device or computer program capable of encoding and decoding a digital data

stream or signal. The word codec is a portmanteau (a blending of two or more words) of

compressor-decompressor or, more commonly, coder-decoder.

The demodulator takes the wavy analog signal from the line and converts it do a digital signal.

The codec puts the transmitted data together from the data the demodulator spits out. A codec is

used to more effectively use the bandwidth..

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