Two-tone buttons identify Background: When you call dial, each key emits different sounds, which is actually made up of some fixed frequency sinusoidal signal synthesis. Because the sound of each key contains two sinusoidal signals of different frequencies, it is also known as " two-tone" signal, abbreviated as DTMF. This is equivalent to different keys using the ' audio' encoded, as the computer industry with the numbers 0 and 1 pair of processing object (including the keyboard) to be encoded.

dtmfData
........\1.wav
........\2.wav
........\9-5-1.wav
........\9-9-1.wav
代码
....\doit.m
....\dtmf.m
....\homework2.m
....\p.m

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