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Asked: 2026-06-15T18:46:08+00:00

I’m trying to compute a MFCC algorithm based upon this paper I found (

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I’m trying to compute a MFCC algorithm based upon this paper I found (http://arxiv.org/pdf/1003.4083.pdf) so what I have done so far is:

step 1) Pre–emphasis

step 2) Framing

step 3) Hamming windowing

step 4) Fast Fourier Transform

step 5) Mel Filter Bank Processing

step 6) : Discrete Cosine Transform

Basically, I took the Mel Bank filters and multiplied them the actual raw signal. I then performed the FFT on these results this looks like this:

FFT on Frame 1:

enter image description here

And then I computed the DCT of the FFT, which results look like this:

DCT on Frame 1:

enter image description here

Does this look correct so far? Is there even a way for me to check this, so that I know that I am going in the right direction?

Also, I need to get 13 Coefficients but I do not know how to determine which of these to get. I get 256 values, so do I take the first 13 of them? Or, do I get the total energy?

I hope someone can help me.

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1 Answer

  1. Editorial Team

    No, you are wrong.

    You need to compute logarithm of the mel filter bank energies after FFT and only then apply DCT. The number of energies of filterbanks should be about 20 or 40, after DCT you should get 20 or 40 numbers and take first 13.

    What you did with FFT is all wrong.

    You might want to read some MFCC code instead of doing something from scratch, there are many implementations out there, for example in sphinxbase:

    http://cmusphinx.sourceforge.net

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