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1994-02-21
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Apparently-To: john.smith@gravis.com
GUS Programmer's Digest Sun, 20 Feb 94 4:24 Volume 9: Issue 11
Today's Topics:
.XMI files (2 msgs)
Error in yesterday's posting.
GUS Programmer's Digest V9 #10 (2 msgs)
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: Sat, 19 Feb 1994 08:39:05 -0600 (CST)
From: Christopher Allen Kalin <ckalin@kelvin.cae.uwm.edu>
Subject: Re: .XMI files
> Does anyone know of a program which will convert files in .XMI
> format to .MID format, or of a program which will play .XMI
> files on the GUS?
If you get the Miles Drivers Developer's Kit on epas, it has a player
that can play XMI files on any concievable soundcard. But, I don't
think it's cool to just distribute the player, I'm not sure.
As far as converting them, I'm still working on that. I'l post to the
list when I find out anything.
Chris Kalin
------------------------------
Date: Sun, 20 Feb 1994 14:18:25 +0800 (WST)
From: b2502056@cc.ntu.edu.tw (b2502056)
Subject: .XMI files
> Date: Fri, 18 Feb 94 12:35:13
> From: ay-a@minster.york.ac.uk
> Subject: .XMI files
>
> Does anyone know of a program which will convert files in .XMI
> format to .MID format, or of a program which will play .XMI
> files on the GUS?
There are only one program which convert .MID to .XMI format, as I know.
XMI format is only for Miles Driver. So you need Ultrasound Miles Driver.
And besides, you need the player. Some days ago in EPAS, there is a file
named DMKIT.ZIP, Miles Driver Source Code. In DMKIT.ZIP, it contains
MIDIFORM.EXE which convert .MID to .XMI format and some source code
which can play .XMI format through SoundBlaster,Ultrasound....etc.
All in all, you may try to find it. But DMKIT.ZIP was killed by EPAS.
In The Audio Solution BBS you can fint it,too. Good Luck !!
______________________________________________________________________
| Taipei,Taiwan,ROC | \ / ///// / /
______ ^^^^^^^^^^^^^^^^^^^^^ / \ / / / /
/ ~ ~ \ / \ / /////
| O O | Whatever the world becomes,
| ^^ | play your own role, be yourself.
\__()__/ ::: Howard Yeh :::
b2502056@cc.ntu.edu.tw
______________________________________________________________________
------------------------------
Date: Sat, 19 Feb 1994 13:24:37 -0800 (PST)
From: wyatt cheng <wyattc@sfu.ca>
Subject: Error in yesterday's posting.
There was somebody yesterday who stated that all notes are referenced
with respect to A, and that A is 400 Hz.
Actually, the A _below_ middle C is 440 Hz, the one above 880 and the
one below 220.
--
Wyatt Cheng
wyattc@sfu.ca
------------------------------
Date: Sat, 19 Feb 94 12:35 EST
From: "Matthew E. Bernold" <MEB117@PSUVM.PSU.EDU>
Subject: Re: GUS Programmer's Digest V9 #10
>Date: Fri, 18 Feb 1994 11:10:15 -0700 (MST)
>From: "Shawn T. Rutledge" <rutledge@enuxsa.eas.asu.edu>
>Subject: Re: GUS Programmer's Digest V9 #9
>
>> with the root frequency. Also, I'm not familiar with the actual
>> characteristics of sound. Is there a formula for computing pitch? I
>> guess its on an exponential or logarithmic scale? Can someone help?
>
>Pitch is simply the frequency in hertz (number of oscillations between
>adjacent peaks per second). However, if by pitch you mean "which key on
>the piano is it?" there is a formula - hopefully somebody will post it.
>But every octave is twice the frequency of the next lower octave. That
>is, if middle c is 256 hertz, then the C below that is 128, and the C
>above is 512. However, generally the reference is the A above middle
>C. Pianos and other instruments are generally tuned so that this A
>is exactly 400 hertz (and the A below is 200, and the one above is 800, etc.)
>Then middle C isn't exactly 256 hertz anymore.
Well, the formula, as I understand it, is:
freq+halfstep = freq * 2^(1/12) or halfstep=e^(1/12 * ln(2))
But I think you are wrong about A being 400 Hz. By the above formula:
A = 200.000Hz
A#/Bb = 211.893Hz
B = 224.493Hz
C = 237.842Hz
C#/Db = 251.985Hz
D = 266.969Hz
D#/Eb = 282.844Hz
E = 299.663Hz
F = 317.482Hz
F#/Gb = 336.360Hz
G = 356.361Hz
G#/Ab = 377.551Hz
A = 400.001Hz
This puts C at 237.842Hz. I was always under the impression that A was
440Hz. Using the above formula, that makes:
A = 220.000
A#/Bb = 233.082
B = 246.942
C = 261.626
C#/Db = 277.183
D = 293.665
D#/Eb = 311.127
E = 329.628
F = 349.229
F#/Gb = 369.995
G = 391.996
G#/Ab = 415.305
A = 440.000
This puts C much closer to 256Hz. I'm pretty sure that the formula is
correct as well.
Matthew E. Bernold MEB117@PSUVM.PSU.EDU
<<APOCALYPSE>> meb117@wilbur.cac.psu.edu
------------------------------
Date: 19 Feb 1994 11:22:54 -0400 (EDT)
From: KKURIAN@smith.smith.edu
Subject: Re: GUS Programmer's Digest V9 #10
"Shawn T. Rutledge" <rutledge@enuxsa.eas.asu.edu> wrote:
> Pianos and other instruments are generally tuned so that this A
> is exactly 400 hertz....
Nope. In the US, "Middle" A=440 Hz. This may be slightly higher or lower
if you are talking about music in other countries or from other time periods
-Cat
------------------------------
End of GUS Programmer's Digest V9 #11
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