Help with fast fourier transform that shows the difference between the two audio .wav

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I want help with Fast Fourier Transform that shows the difference between the two audio .wav and dusplay the diffrent between it in percentage%
such as diffrent between speech in .wav in c# or in vb.net

What I have tried:

i dont know how to implement it

Posted 4-May-17 14:06pm

giant18

Updated 4-May-17 23:10pm

OriginalGriff

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Ralf Meier 5-May-17 3:08am

I don't know how to give an answer to a question with such less Information ...
Perhaps you describe a little more what you have done and how you have done it.
Also it would be interesting what result you aim ...
The FFT divides a Signal into it's frequency-parts - are you sure that you want this ?

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Jochen Arndt · Answer 1 · 2017-05-04T23:10:00

Your question is rather vague.

But it seems that you have to:

Perform FFT on both audio files
Searching the net should provide you with example code and libraries for various programming languages and how to apply FFTs to WAV files.

Scale the results
Because you want the percentage ratio you have to scale both FFTs to the same level.

Caluclate the percentage ratio for each frequency
The simplest part:

ratio[freq] = 100 * scaled_fft1[freq] / scaled_fft2[freq]

Display the result
A simpley x-y diagram where x is the frequency and y is the above calculated ratio.