DUAL TONE MULTI FREQUENCY
\djˈuːə͡l tˈə͡ʊn mˈʌltɪ fɹˈiːkwənsi], \djˈuːəl tˈəʊn mˈʌltɪ fɹˈiːkwənsi], \d_j_ˈuː_əl t_ˈəʊ_n m_ˈʌ_l_t_ɪ f_ɹ_ˈiː_k_w_ə_n_s_i]\
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(DTMF, or "touch-tone") A method used by thetelephone system to communicate the keys pressed whendialling. Pressing a key on the phone's keypad generates twosimultaneous tones, one for the row and one for the column.These are decoded by the exchange to determine which key waspressed.
By Denis Howe
