翻訳と辞書
Words near each other
・ modcal
・ mode
・ mode bit
・ modef
・ model
・ model checking
・ model view controller
・ modeling
・ modelling
・ modelsim
modem
・ modem7
・ moderator
・ modified frequency modulation
・ modifier
・ modsim
・ modsim ii
・ modula
・ modula-2
・ modula-2*


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modem : FOLDOC
modem
(Modulator/demodulator) An electronic device for converting between serial data (typically EIA-232) from a computer and an audio signal suitable for transmission over a telephone line connected to another modem. In one scheme the audio signal is composed of silence (no data) or one of two frequencies representing zero and one.
Modems are distinguished primarily by the maximum data rate they support. Data rates can range from 75 bits per second up to 56000 and beyond. Data from the user (i.e. flowing from the local terminal or computer via the modem to the telephone line) is sometimes at a lower rate than the other direction, on the assumption that the user cannot type more than a few characters per second.
Various data compression and error correction algorithms are required to support the highest speeds. Other optional features are {auto-dial} (auto-call) and {auto-answer} which allow the computer to initiate and accept calls without human intervention.


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