Re: Bates's question about claps (Eckard Blumschein )

Subject: Re: Bates's question about claps
From:    Eckard Blumschein  <Eckard.Blumschein(at)E-TECHNIK.UNI-MAGDEBURG.DE>
Date:    Wed, 16 May 2001 07:45:17 +0200

At 22:23 15.05.2001 +0200, Alexandra Hettergott wrote: >Imho, why not simply assume a (grouped) mental representation of the >(tonal) phenomenon of a clapping crowd .... >....stimulus (phase) density,.... Each single clap already has a broadband spectrum. Asynchronous clapping is a noise that largely lacks spectral features. It is anything but tonal. Forget spectral analysis and tonotopy in that case. We have to understand how in particular the high-CF AN-fibers mediate random modulation. Wasn't Al quite right when he pointed to logical inversion? I imagine already neurons in cochlear nucleus and inferior colliculus pre-extracting some features via excitatory as well as inhibitory cooperation. Don't believe that quality of clapping cannot be judged. I thoroughly dealt with a similar sound from arc welding where the welder is paid for adjusting the process by ear much more subtly accurately that any automatic control system. To a lesser degree we are able to recognize whether clapping is frenetic, more moderate, just polite, modest, reluctant, or whatsoever. The temporal structure can be described by statistical parameters. I am not sure whether my knowledge of terms like standard deviation, variance, slant, median, etc. is correct, and I doubt the more that there are already adequate psychoacoustic parameters. Presumably, audition outperforms any pertaining mathematical theory by far. I merely conclude from the obvious abundance of describing words like bong, boom, whang, wham, wheezy, whistle, whicker, whimper, whine, whirr, whisp, whist, whistle, whizz, whoosh, and whuff that there are perhaps scores of learned temporal patterns of more or less similar to each other natural sounds rather than a comprehensive and well organized system of clearly separated streams and groups to simply figure out. The welders used to say: Short arc welding is best if it is sizzling like bacon in a pan. Eckard

This message came from the mail archive
maintained by:
DAn Ellis <>
Electrical Engineering Dept., Columbia University