DTMF
dual-tone multifrequency (generation)
(アナログ電話機の)デュアル トーン多周波数発生器. ダイアル用のタッチトーン.
dual-tone multifrequency (generation); a dial tone signal generator for PB(push-button) telephones; in analog cellular telephones; ref. DTMF codes are 1(697Hz+1209Hz), 2(697Hz+1336Hz), 3(697Hz+1477Hz), 4(770Hz+1
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