Subject: More cepstrum flaws From: Arturo Camacho <acamacho@xxxxxxxx> Date: Mon, 12 Jan 2009 07:59:00 -0800 List-Archive:<http://lists.mcgill.ca/scripts/wa.exe?LIST=AUDITORY>Dear members of the list, Continuing with the ongoing criticism of cepstral methods, I want to reference a paper I published in which it is shown that, from a theoretical point of view, cepstrum does not work when there are zeros in the spectrum (e.g., for periodic signals): Camacho, A. (2008). "Comment on 'Cepstrum pitch determination' [J. Acoust. Soc. Am. 41, 293–309 (1967)]," Journal of the Acoustical Society of America, vol. 124, pp. 2706-2707. The point made in the paper is that zeroes in the spectrum are mapped by the logarithm to minus infinity, and since functions with non-finite open sets do not have a Fourier transform, the last step of cepstrum cannot be performed. Arturo -- __________________________________________________ Arturo Camacho, PhD Alumni Computer and Information Science and Engineering University of Florida E-mail: acamacho@xxxxxxxx Web page: www.cise.ufl.edu/~acamacho __________________________________________________