(LASZLO Toth )

From:    LASZLO Toth  <tothl(at)INF.U-SZEGED.HU>
Date:    Wed, 12 Nov 1997 15:07:00 MET

>From tothl Wed Nov 12 15:07:01 +0100 1997 remote from inf.u-szeged.hu Date: Wed, 12 Nov 1997 15:07:01 +0100 (MET) From: Toth Laszlo <tothl(at)inf.u-szeged.hu> X-Sender: tothl(at)csilla To: Multiple recipients of list AUDITORY <AUDITORY(at)VM1.MCGILL.CA> Subject: Problem with Seneff's model Message-ID: <Pine.SV4.3.91.971112142420.25769A-100000(at)csilla> MIME-Version: 1.0 Received: from inf.u-szeged.hu by inf.u-szeged.hu; Wed, 12 Nov 1997 15:07 MET Content-Type: TEXT/PLAIN; charset=US-ASCII Content-Length: 1901 Dear List, I have a rather technical problem with Seneff's ear model (with the "inner hair cell/synapse model" part). I've implemented it following the Journal of Phonetics 1988 theme issue. All processing stages seem to work fine, except the "rapid AGC" routine, which practically has no effect (there's a figure showing the model's response to a sinusoid signal - I used this to verify the correctness of my implementation). As an alternative source I've also checked Malcolm Slaney's Auditory Toolbox, in which there's a source code taken from B.D. Bryant and J.D. Gowdy. Their code does exactly the same as mine. There's also a figure in the documentation: "Figure 3 of Seneff's paper can be duplicated with the following statements ... which produces the following plot ..." and the rapid AGC stage of the figure is clearly different from the one in the article. Strange that neither the authors, nor Mr. Slaney have noticed this (?). I guess that someone of you uses this model, had realized and cured this problem. If so, I'd be very glad if you shared your solution with me. I'd also be happy if someone could point me to other (detailed) references (or implementation sources) on this model, so I could find a correction myself. Thanks, Laszlo ****************************************************************************** * Toth Laszlo * * * Hungarian Academy of Sciences * "In our life there's if * * Research Group on Artificial Intelligence * In our beliefs there's lie * * * In our business there's sin * * e-mail: tothl(at)inf.u-szeged.hu * In our bodies there's die" * * http://www.inf.u-szeged.hu/~tothl * * ******************************************************************************

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DAn Ellis <dpwe@ee.columbia.edu>
Electrical Engineering Dept., Columbia University