CNET Glossary: demodulation

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CNET GLOSSARY: Terms for the techie

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demodulation
The process of decoding an analog signal into digital data. When data is transferred over phone lines, for example, a modem modulates the data into audible tones "carried" on frequencies between 0Hz and 4KHz. When the data reaches its intended destination, another modem demodulates the signal back into digital data. Cable TV networks also use modulation techniques to transfer data. But instead of transmitting audible tones, cable providers have sophisticated digital modulation schemes to greatly increase the amount of data that can be sent.

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