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1994-03-09
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Apparently-To: john.smith@gravis.com
GUS Programmer's Digest Mon, 7 Mar 94 19:01 PST Volume 9: Issue 23
Today's Topics:
clipping
GUS+16-bit option or MAX?
GUS Programmer's Digest V9 #22 (2 msgs)
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Standard Info:
- Meta-info about the GUS can be found at the end of the Digest.
- Before you ask a question, please READ THE FAQ.
----------------------------------------------------------------------
Date: 7 Mar 94 10:15:00 MET
From: "VISX80::GRECNER" <GRECNER%VISX80.decnet@musx53.zfe.siemens.de>
Subject: clipping
>> The GUS doesn't do anything like that. It simply sums the voices. Because
>> of partial cancelling (some of the samples will be positive, while others
>> will be negative), clipping rarely occurs when typical voice volumes are
>> used.
>Rarely? There is no algorithm to prevent it at all?
It would be very strange, if there's no such algoithm, in my opinion.
And dangerous for the sound. But I like the idea of signed approach
to digital mixing. I didn't think of the data as being signed till now.
In this case, it's statistically really not so bad. But I still think
it can't just clip the wave to the maximum voltage until the sum of
all voices becomes less than the maximum... The breaks all I was
thinking about. But maybe I was wrong... If that's true, than it's
really only me who can assign apropriate volume settings to all the
instruments hoping the probability of not exceeding the maximum is
great enough ... I don't like it, however. Aren't here any documents
from Gravis describing this ? Or from Ensoniq as the GF1 is supposed
to be a clone of some Ensoniq chip ?
Martin Grecner
------------------------------
Date: Mon, 07 Mar 94 14:40:00 PST
From: "Ford, Richard x2056" <rford@infocomp.csir.co.za>
Subject: GUS+16-bit option or MAX?
Morning all
Please, can someone put me in the picture re the MAX? Should I go for the
GUS and the 16-bit option now, or wait for the MAX to arrive? If the
MAX is on the cards, then I'll wait, but I have been waiting a while now and
I'd actually like to get stuck in with one or the other...
waiting in anticipation..Richard
------------------------------
Date: Sun, 6 Mar 1994 20:51:49 -0500 (EST)
From: Phat H Tran <ptran@sciborg.uwaterloo.ca>
Subject: Re: GUS Programmer's Digest V9 #22
> Date: Sat, 5 Mar 1994 23:31:28 -0700 (MST)
> From: "Shawn T. Rutledge" <rutledge@enuxsa.eas.asu.edu>
> Subject: Re: GUS Programmer's Digest V9 #21
>
> > The GUS doesn't do anything like that. It simply sums the voices. Because
> > of partial cancelling (some of the samples will be positive, while others
> > will be negative), clipping rarely occurs when typical voice volumes are
> > used.
>
> Rarely? There is no algorithm to prevent it at all?
Nope. And from the usual sound quality of the GUS, there doesn't
appear to be a need to systematically divide the sum to rigorously
prevent the possibility of clipping, and the GUS would, in fact,
sound worse had this approach been taken (since dividing by the number
of voices, 32, would mean that only 11 bits of each voice would show
up in the output).
Phat.
------------------------------
Date: Sun, 6 Mar 1994 18:27:26 -0800 (PST)
From: Shawn Talbert <ironside@beta.tricity.wsu.edu>
Subject: Re: GUS Programmer's Digest V9 #22
There may not be an "algorithm" to prevent it, but there is most likely
hardware restraints on the audio output amplifiers to ensure linear
operation. That is, the maximum possible output should be reasonably
below the rails.
> > The GUS doesn't do anything like that. It simply sums the voices. Because
> > of partial cancelling (some of the samples will be positive, while others
> > will be negative), clipping rarely occurs when typical voice volumes are
> > used.
>
> Rarely? There is no algorithm to prevent it at all?
>
>
> --
> _______ KB7PWD
> (_ | |_) shawn.rutledge@asu.edu
> __) | | \__________________________________________________________________
> * anti-Macintosh * ham radio * sci fi * packet * techno * Internet * IEEE *
>
> ------------------------------
>
> End of GUS Programmer's Digest V9 #22
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>
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------------------------------
Date: Mon, 7 Mar 94 16:57:32 +0100
From: Marcus Jansson <d93marja@und.ida.liu.se>
Subject: unsubscribe
------------------------------
End of GUS Programmer's Digest V9 #23
*************************************
To post to tomorrow's digest: <gus-sdk@mail.orst.edu>
To (un)subscribe or get help: <gus-sdk-request@mail.orst.edu>
To contact a human (last resort): <gus-sdk-owner@mail.orst.edu>
FTP Sites Archive Directories
--------- ------- -----------
Main N.American Site: archive.orst.edu pub/packages/gravis
wuarchive.wustl.edu systems/ibmpc/ultrasound
Main Asian Site: nctuccca.edu.tw PC/ultrasound
European Callers ONLY: theoris.rz.uni-konstanz.de pub/sound/gus
Submissions: archive.epas.utoronto.ca pub/pc/ultrasound/submit
Newly Validated Files: archive.epas.utoronto.ca pub/pc/ultrasound
Mirrors: garbo.uwasa.fi mirror/ultrasound
MailServer For Archive Access: Email to <mail-server@nike.rz.uni-konstanz.de>
Hints:
- Get the FAQ from the FTP sites or the request server.
- Mail to <gus-sdk-request@mail.orst.edu> for info about other GUS
related mailing lists (general use, musician's, etc.).