Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!csd4.milw.wisc.edu!trantow
From: trantow@csd4.milw.wisc.edu (Jerry J Trantow)
Newsgroups: comp.sys.amiga.tech
Subject: Volume Modulation
Message-ID: <1683@csd4.milw.wisc.edu>
Date: 24 Mar 89 14:22:58 GMT
Sender: news@csd4.milw.wisc.edu
Reply-To: trantow@csd4.milw.wisc.edu (Jerry J Trantow)
Organization: University of Wisconsin-Milwaukee
Lines: 30

Put LineEaters on a diet.

Has anyone out there used volume modulation to get sound better than 
simply using 8 bits.  What I have in mind is using both volume and 
waveform to increase the quality of sound.  I had a little hack 
running about a year ago where 	I took some 12 bit samples (Curly, Larry,
and Moe) calculated a volume envelope and waveform and played the 
samples thru the audio device.  I was fairly disappointed because it 
seems like the volume and waveform were not changing simultaneously.

For a vivid demonstration of this, take any 12 bit number and factor it
into a 6 bit (volume) and 8 bit (waveform) number.  If they both 
changed simultaneously it should work.  (Didn't work for me.)

I think what is happening is one channel changes before the other and
a one bit change in volume multiplied by the waveform is a pretty big
error.

I am interested for a couple of reasons in pulling this off and will
go so far as to put in a S/H if I have to. (Sample and Hold)  I would 
appreciate any comments.

I let someone use my hardware manual two months ago and haven't gotten
it back yet so I appologize that I have not verified this with the book.
_____________________________________________________________________________
Jerry J. Trantow          | I love the man that can smile in trouble,
1560 A. East Irving Place | that can gather strength from distress, 
Milwaukee, Wi 53202-1460  | and grow brave by reflection. 
(414) 289-0503            |                         Thomas Paine
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