cepstra ==>
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).
[What's it for?]
(1997-01-07)
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