Excitation-pattern models (reply to Peter Meijer) (SOREN BUUS )

Subject: Excitation-pattern models (reply to Peter Meijer)
Date:    Wed, 11 Jun 1997 09:12:15 -0500

Dear Peter, You probably considered excitation-pattern models already. If not, I'd like to put in a plug for them. They might be useful and I think= that at least a handful of people might believe in them. Look in Zwicker and Fastl (1990) for the fundamentals and for calcu= lations of virtual pitch. For jnds, look in Florentine and Buus (JASA, 1981) for how to get jnds. Buus (1997; Encyclopedia of Acoustics) shows ho= w to use an auditory-filter model (which is just a type of excitation-p= attern model) to provide calculations of frequency effects and signal durati= on effects in simultaneous masking. In that chapter you will also find an empirical formula for calcula= tion of forward masking, but that doesn't qualify as a model. You could look= to Zwicker (JASA 1976 or 1977; Zwicker and Fastl, 1990) for a more model= -based approach to forward masking. Last, but not least, Brian Moore and co= -workers (mostly Brian Glasberg) have published several papers on their versio= n of the excitation-pattern model.=20 I'd suggest that you use the auditory-filter model to produce excit= ation patterns and then apply the decision models described in the various = papers to obtain the results that you are looking for. I am not aware of any work on excitation-pattern models for auditor= y-profile discrimination, but there is no reason why it shouldn't work quite we= ll. The Ito, Braida, Durlach (later used by Green) model is essentially an ex= citation pattern model, except that it looks only at the physical stimulus--as= opposed to the excitation patterns. I don't think that the results would be = much different if it were to use excitation patterns--and for my money, it= would make the model a lot more compelling.=20 Best wishes, S=BFren Buus

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Electrical Engineering Dept., Columbia University