<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.
(1995-03-28)
Nearby terms:
Dual In-Line Package « dual ported « dual-stack « Dual Tone Multi Frequency » duck typing » DUEL » Duff's device