From:    at <tothlINF.U-SZEGED.HU>
Date:    Wed, 23 Jun 1999 19:46:00 MET

>From tothl Wed Jun 23 19:46:39 +0200 1999 remote from inf.u-szeged.hu Date: Wed, 23 Jun 1999 19:46:39 +0200 (MET DST) From: Toth Laszlo <tothl(at)inf.u-szeged.hu> X-Sender: tothl(at)csilla To: auditory(at)lists.mcgill.ca Subject: Re: Pascal per Hertz In-Reply-To: <9906231736.ZM5453(at)fonsg9.hum.uva.nl> Message-ID: <Pine.SV4.3.91.990623192837.6144A-100000(at)csilla> MIME-Version: 1.0 Received: from inf.u-szeged.hu by inf.u-szeged.hu; Wed, 23 Jun 1999 19:46 MET Content-Type: TEXT/PLAIN; charset=US-ASCII Content-Length: 1601 On Wed, 23 Jun 1999, Paul Boersma wrote: > Praat is not Matlab. The sound is in a Sound object, which has information > about the time domain and about the sampling, and is considered to carry > samples that represent air pressures in Pascal. The "fft" converts this > Sound object into a Spectrum object FFT is not Matlab. FFT is not Praat. FFT (or, rather, DFT) is a formula that converts a series of numbers into another series of numbers. For me. That's why I didn't get your previous mail. Sorry. No I see that by "Praat fft" you meant "the spectrum analysis facilities (and the belonging objects) in the Praat software package". (At first I thought "Praat FFT" was something like "Bruun FFT" or "Sorensen FFT"...) > In Praat, the maximum absolute value of the samples is 1, which, if considered > Pascals, corresponds to an intensity of 94 dB re auditory threshold. > [...] you should use a dB meter once, > with your computer set to a maximum input gain, and use the same gain > setting for all subsequent recordings. > Sounds uncomfortable to give a dB meter with each copies of a speech recognizer (well, usually you'll have to buy a special mike with it anyway, so...). Or should we avoid non-linear preprocessing? Laszlo Toth * "I don't like people Hungarian Academy of Sciences * working all day, Research Group on Artificial Intelligence * only working just to e-mail: tothl(at)inf.u-szeged.hu * see next tomorrow" http://www.inf.u-szeged.hu/~tothl * /Accept/

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Electrical Engineering Dept., Columbia University