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2 definitions found
 for modulator-demodulator
From The Collaborative International Dictionary of English v.0.48 :

  modulator-demodulator \mod"u*la`tor-de`mod"u*la`tor\, n.
     An electronic device that converts electronic signals into
     sound waves, and sound waves into electronic signals, used to
     transmit information between computers by the use of ordinary
     telephone lines; usually called a modem.
     [PJC]

From The Collaborative International Dictionary of English v.0.48 :

  modem \mo"dem\ (m[=o]"d[e^]m), n. [by shortening from
     modulator-demodulator.]
     An electronic device that converts electronic signals into
     sound waves, and sound waves into electronic signals, used to
     transmit information between computers by the use of ordinary
     telephone lines; also called modulator-demodulator; as, the
     latest modems can transmit data at 56,000 baud over a clear
     telephone line. The speed of transmission of information by a
     modem is usually measured in units of baud, equivalent to
     bits per second.
     [PJC]

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