dual tone multi-frequency (DTMF)
Definition
Touch tone' used in non-rotary type dial (push button) phones. DTMF uses a combination of two (one low frequency and one high frequency) tones to identify the dialed number or a signal. Eight such frequencies are assigned to the four rows and four columns of a typical push-button type dial (keypad). All modern modems also generate DTMFs.
dual tone multi-frequency (DTMF) is in the Data Management, Communications, & Networks subject.
dual tone multi-frequency (DTMF) appears in the definition of the following term: touch tone
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