Dual Tone Multi Frequency

<communications> (DTMF, or "touch-tone") A method used by the telephone system to communicate the keys pressed when dialling.

Pressing a key on the phone's keypad generates two simultaneous tones, one for the row and one for the column. These are decoded by the exchange to determine which key was pressed.

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Dual In-Line Dual In-line Memory Module Dual In-Line Package dual ported dual-stack	DTMF	DUEL Duff's device dumbed down dumb terminal dump