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Meaning of DUAL TONE MULTI FREQUENCY

 
Computing Dictionary
 
 Definition: 

(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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