a/d converter

Science Dictionary
A/D converter  
Short for analog to digital converter. An electronic device that takes a voltage source as an input, and yields a digital numerical output indicating the strength of the voltage at the source. A/D converters are used in digital recording devices, in which an audio signal in an electronic circuit (as picked up by a microphone) is digitized and recorded on disk or tape. Compare D/A converter.
The American Heritage® Science Dictionary
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