DTMF DTMF (Dual Tone Multi-Frequency) signal, is one of two specific A combination of audio frequency signals to represent the number or function. In the DTMF telephone has 16 buttons, which 10 number keys 0- 9, 6 function keys*,#, A, B, C, D. 12 of them Keys is more familiar with the keys, another set from the first four buttons as retention of a functional Key left for future uses. According to CCITT recommendations, the international use of 697Hz, 770Hz, 852Hz, 94lHz low frequency group and 1209Hz, 1336Hz, 1477Hz, 1633Hz frequency group. From the low group and high-frequency group out of any one frequency for each combination, a total of 16 combinations, the number of representatives of 16 different Character or function keys, each key uniquely by a group composed of row frequency and column frequency

电话拨号音的合成与识别\lixiaoyong_qin.fig
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电话拨号音的合成与识别

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