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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク telecommunications device for the deaf ： FOLDOC Telecommunications Device for the Deaf (TDD) A terminal device used widely by deaf people for text communication over telephone lines. The acronym TDD is sometimes expanded as "Telecommunication Display Device" but is generally considered to be derived from "Telecommunications Device for the Deaf". The deaf themselves do not usually use the term "TDD", but prefer simply "TTY" -- possibly the original term. The ambiguity between this and the other meanings of "TTY" is generally not problematic. The acronym "TTD" is also common [Teletype for the deaf?]. The standard most used by TDDs is reportedly a survivor of Baudot code. It uses asynchronous transmission of 1400 Hz and 1600 Hz tones at 45.5 or 50 baud, with one start bit, 5 data bits and 1.5 {stop bits}. This is generally incompatible with standard modems. A typical TDD is a device about the size of a small laptop computer (resembling, in fact, a circa 1983 Radio Shack {Model 100} compute スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.