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)


I think there is an error in the reference to the thesis of Pols:

  1. ^ L. C. W. Pols (1966), "Spectral Analysis and Identification of Dutch Vowels in Monosyllabic Words," Doctoral dissertion, Free University, Amsterdam, The Netherlands

it was written in 1977 according to his website:

http://www.fon.hum.uva.nl/pols/ —Preceding unsigned comment added by 84.202.69.187 (talk) 09:34, 7 April 2010 (UTC)

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