[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

*To*: AUDITORY@xxxxxxxxxxxxxxx*Subject*: Re: cepstrum: computing epsilon*From*: Paul Boersma <boersma@xxxxxxxxxxxxxx>*Date*: Wed, 23 Jun 1999 21:42:27 -0600*In-reply-to*: tothl@INF.U-SZEGED.HU "" (Jun 23, 7:46pm)*References*: <199906231747.NAA27530@sirocco.cc.mcgill.ca>*Reply-to*: boersma@xxxxxxxxxxxxxx*Sender*: AUDITORY Research in Auditory Perception <AUDITORY@xxxxxxxxxxxxxxx>

On Jun 23, 7:46pm, Laszlo Toth wrote: > FFT (or, rather, DFT) is a formula that > converts a series of numbers into another series of numbers. For me. > (...) Now I see that by > "Praat fft" you meant "the spectrum analysis facilities (and the belonging > objects) in the Praat software package". Exactly. That is the advantage of having a program that models the physics (like Praat) instead of the mathematics (like Matlab). Someone complained about the problem of choosing the "epsilon" in a Matlab implementation of the cepstrum. In a Praat script, you can express this epsilon in physical units. So if you want to add white noise with a density of 10^-8 Pascal/Hertz, your cepstrum routine would be To Spectrum Formula... if row=1 ... then log10 (self[1,col]^2 + self[2,col]^2 + (1e-8)^2) ... else 0 fi To Sound (row one is the real part, row two the imaginary part; Matlab does have the advantage of doing complex arithmetic less verbosely) -- Paul Boersma Institute of Phonetic Sciences, University of Amsterdam Herengracht 338, 1016CG Amsterdam, The Netherlands tel: +31-20-5252385 / 5252183 (fax: 5252197) http://www.fon.hum.uva.nl/paul/

**References**:**[no subject]***From:*tothl

- Prev by Date:
**Position Opening in Colleague's Laboratory** - Next by Date:
**CSNLP-8 Galway Ireland August** - Previous by thread:
**[no subject]** - Next by thread:
**Position Opening in Colleague's Laboratory** - Index(es):