Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!swrinde!kent
From: kent@swrinde.nde.swri.edu (Kent D. Polk)
Newsgroups: comp.sys.amiga.audio
Subject: Re: Disable low-pass filter on Amiga 500?
Keywords: audio-filter
Message-ID: <2025@swrinde.nde.swri.edu>
Date: 23 Mar 91 16:59:47 GMT
References: <9103192231.39@rmkhome.UUCP> <1991Mar22.015657.20512@cs.umu.se> <20058@cbmvax.commodore.com>
Sender: news@swrinde.nde.swri.edu
Organization: Southwest Research Institute, San Antonio, Texas
Lines: 30

In article <20058@cbmvax.commodore.com> drysdale@cbmvax.commodore.com (Scott Drysdale) writes:
>In article <1991Mar22.015657.20512@cs.umu.se> dvljhg@cs.umu.se (J|rgen Holmberg) writes:
>
>[ misc stuff about audio filters deleted ]
>
>>The lowpass filter cuts off sound at 7Mhz, if you disable it you will get
>>sound up to about 14 Mhz. The difference is great! ( Even I hear it ;-) )
>
>i wish i could hear 14mhz.  then i wouldn't need an oscilloscope to debug
>those home projects.

Just pull out your handy 50 MHz Amiga digitizer and then downconvert it
using that nice built-in 4-channel synthesizer :^)

Actually, the auditory system handles information a bit different than
the visual & you would have to re-present the waveform information in a
manner which allows the aural system to identify what you want
identified (the easy one).  Patter-recognition techniques can be used
also. Recent research on the subject appears to show that the same
Gestalt rules developed for visual perception apply in the aural realm,
but are implemented a bit differently. The auditory system is 'stream'
oriented, i.e. lower brain activities attempt to group acoustic
'events' in preparation for higher brain identification activities.
Unfortunately, we can only attend to one stream at a time.

(I have been doing some research along this line using Amigas)

Kent Polk: Southwest Research Institute (512) 522-2882
Internet : kent@swrinde.nde.swri.edu
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