How to detect a phone number from dtmf wav file?

Question

M 2013-12-1

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/108169-how-to-detect-a-phone-number-from-dtmf-wav-file

评论： M 2013-12-2

I need to detect a phone number from wav file.I should use spectral analysis (function spectrogram is preferred).My main issue is detecting tone frequencies.

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Answer 1

Wayne King 2013-12-1

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https://ww2.mathworks.cn/matlabcentral/answers/108169-how-to-detect-a-phone-number-from-dtmf-wav-file#answer_116865

Please see this example:

DTMF detection

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M 2013-12-2

Maybe i haven't been specific enough,but it should automatically display phone number,not only to show me spectrogram so I have to decode it by knowing which freq is what number.I tried to solve this by setting all values to 0 in PSD matrix that are less than certain threshold.This way i can "see" each number,but I am not sure how to make Matlab code to read it and display it.This is what i have done so far: http://www.4shared.com/rar/lR7g1QaV/DTMF.html

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