Subject: Re: Gammatone Filterbank Response Area From: "Richard F. Lyon" <lyon(at)APPLE.COM> Date: Thu, 27 Feb 1997 13:56:15 -0800At 5:31 AM -0800 2/26/97, Kien Seng, Wong wrote: > I am currently building a detailed model of the Onset-C units in >the cochlear nucleus. As an input to this model, I am using a Meddis >haircell driven from a gammatone filterbank. I have so far found it >impossible to obtain a suitable asymmetric 'tuning curve' from the >filterbank. > Can anyone suggest ways of obtaining such a response from this >filterbank? The GTF is inherently very nearly symmetrical (the usual approximate analyses are exactly symmetrical in frequency, as is the complex GTF sometimes used). The All-Pole Gammatone Filter (APGF), on the other hand, has a reasonably realistic asymmetry and some other good properties. Read about in my (still incomplete) papers at http://www.pcmp.caltech.edu/anaprose/dick/Auditory/APGF/ --------------------- mailto:lyon(at)research.apple.com --------------------- Dick Lyon Distinguished Scientist Apple Computer 301-3M Apple Research Labs One Infinite Loop phone: (408) 974-4245 Cupertino CA 95014 fax: (408) 974-8414 --------------- http://www.research.apple.com/personal/lyon/ ------------- & Visiting Associate, Caltech Computation and Neural Systems Program ------------------- http://www.pcmp.caltech.edu/~dick/ -------------------