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dual tone multi frequency

dual tone multi frequency in Technology

(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.

The Free On-line Dictionary of Computing, © Denis Howe 2010
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