Talk:Mel-frequency cepstrum

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I am not sure, but I think that MFCC must be computed on the cepstrum, not the spectrum. That means that it is necessary to compute the log of the Mel scaled spectrum before applying the DCT. Am I wrong ? Adoudoux 10:00, 25 February 2007 (UTC)

Your main point is correct - it should be the log amplitudes - thanks for pointing this out. (Your turn of phrase re cepstrum vs spectrum is a bit bizarre - the MFCC is a type of cepstrum, but it is still calculated based on a spectrum, not on another cepstrum.) I'll add the log into the recipe. --mcld 10:43, 26 February 2007 (UTC)

Yes. Sorry, I was wrong. I wanted to say "cepstrum must be calculated by computing the DCT of the log-(Mel-scaled)spectrum. Thanks for the change ! Adoudoux 06:16, 27 February 2007 (UTC)