Decoding DTMF Signal using FFT

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kyin gab
kyin gab 2012 年 11 月 29 日
Given the sampling frequency Fs, I would like to decode the numbers in a dtmf signal using FFT.
The signal was given in an audio format.
I can get the signal from the audio file, find the length of the signal and the total time. I can also plot the signal against its time. All this I can do.
However, I am stuck since I do not know the next step to take.
Help and link to some examples will be highly appreciated.

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