cepstrum


Also found in: Wikipedia.

cepstrum

[′sep·trəm]
(acoustics)
The Fourier transform of the logarithm of a speech power spectrum; used to separate vocal tract information from pitch excitation in voiced speech.

cepstrum

(mathematics)
(Coined in a 1963 paper by Bogert, Healey, and Tukey) The Fourier transform of the log-magnitude spectrum:

fFt(ln( | fFt(window . signal) | ))

This function is used in speech recognition and possibly elsewhere. Note that the outer transform is NOT an inverse Fourier transform (as reported in many respectable DSP texts).

Mentioned in ?
References in periodicals archive ?
A cepstrum is the result of taking the Fourier transform of the decibel spectrum (power spectrum) as if it were a signal.
An audio search method based on cepstrum and distance metrics, Microcomputer Application, 27(5): 557-559.
Primarily, the most widely used feature of sound analysis, the Mel Frequency Cepstrum Coefficient (MFCC) (Mahdi and Azizollah, 2009), was extracted and feature dimension reduction was performed in the data preprocessing phase.
24-order Mel Frequency Cepstrum Coefficients was extracted for audio.
Johan (2004), Gearbox Analysis Using Cepstrum Analysis and Comb Liftering, Bruel&Kjaer, Denmark
Datastick's new, exclusive Sharpener[TM] technology shows accurate frequency-domain information in any FFT, PulseDomain or Cepstrum graph.
Sharpener provides a completely new way of showing any frequency-domain, demodulation, and Cepstrum information with no significant compromise of frequency or amplitude accuracy.
2, have been mode in order to diagrams the gearbox:--the diagrams of the signal acquired in time of the power spectrum in frequency and the cepstrum in time for the faultless gear box, considered as reference.
1990), Cepstrum Analysis and Gearbox Fault Diagnosis, Bruel & Kjaer, Application Note, 1990.
Key words: frequencies, spectrum, cepstrum, vibrations
As features we use Mel-Frequency Cepstrum Coefficients (MFCC) 1 to 11 plus the energy of the signal.