Correlogram Web Server (Malcolm Slaney )

Subject: Correlogram Web Server
From:    Malcolm Slaney  <malcolm(at)INTERVAL.COM>
Date:    Thu, 28 May 1998 06:40:57 -0700

We've put a correlogram server on the web and we think it is ready for use. Send us a sound file, and we'll send you back a movie. I've been interested for a long time in mid-level models of auditory perception. We know lots about the cochlea, and we know what comes out at the top (he said XXX, there is a new sound over there, ...) But what happens in the middle? The correlogram is a model of perception after the cochlea. It provides a representation where it is easy to see the periodicity in a signal. Pitch falls out naturally from this representation. Perhaps this is the basis of much of auditory perception. A number of people have experimented with distributing auditory models in source code (i.e. my Auditory Toolbox for Matlab, Ray Meddis and Roy Patterson have been distributing C code.) This is an experiment. No code is necessary, just send us an audio file and we'll supply the CPU cycles. Complete directions are on the web page. The standard browsers should all work. You'll need to be able to play QuickTime movies (builtin on the Macs, free download for PCs, and use a program called xanim on Unix machines.) Let me know what you think. Is this a good way to let other people play with auditory models? Are there missing features? Things that don't make sense? Check it out -- Malcolm McGill is running a new version of LISTSERV (1.8c on Windows NT). Information is available on the WEB at

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Electrical Engineering Dept., Columbia University