[PD] midi latency test

[Greg Rippin]

Do MIDI In jacks still use opto-isolator components?  I think they did
in the original spec...  The rise- and fall-times could account for the
added delay perhaps?



Larry Troxler wrote:
> 
> Well, I was going to actually cable this up, and then I realized that it's not
> so easy with the standard soundblaster MIDI adapter I'm using, since it
> doesn't provide female sockets, but instead, male cable ends. So in my case,
> I can't just take a MIDI cable and connect the input to the output!
> 
> So jmf3 and PT147,  are you really talking about hardware MIDI, and if so, I
> take it you both have a MIDI interface card other than the soundblaster
> adaptor?  If not, the how did you do it? Yes you can pass it through the
> Input and Through ports on a synth, but I think that first you would want to
> make sure that the "thru" port is really a hardware circuit connection, and
> not implemented in software in the synth.
> 
> If you _are_ really talking about MIDI, and not software emulation of it
> within the PC, then even so, 35 to 40 ms seems a bit long (these are ms
> values, right?).
> 
> PT147, you say that it's going to be more than 10. If this is milliseconds,
> I'm not so sure why that would be normal, because a complete MIDI message
> should go through the interface in about 1 ms. So any delay much greater than
> this should be due to the operating system and it's drivers. Am I missing
> something? Unoftunately, neither PT147 nor jmf3 said what OS they are running
> on. I have the feeling that this is where the problem lies. jmf3, what do you
> mean by "very high"?
> 
> Regards
> 
> Larry Troxler
> 
> On Wednesday 05 March 2003 21:29, PT147 at mdx.ac.uk wrote:
> > I got between 35 and 40 ish.   Surely it's going to be >10, anyway,
> > because of the delay.
> >
> > ----- Original Message -----
> > From: "jfm3" <jfm3 at ouroboros-complex.org>
> > To: <pd-list at iem.kug.ac.at>
> > Sent: Thursday, March 06, 2003 12:17 AM
> > Subject: [PD] midi latency test
> >
> > > If you have some time, please connect your MIDI in to your MIDI out and
> > > bang on the attached patch. Let me know what number you get. I would
> > > expect this number to be very low; around 1. On my systems it is very
> > > high, and I'm not sure why.
> > >
> > > --
> > > (jfm3  2838 BCBA 93BA 3058 ED95  A42C 37DB 66D1 B43C 9FD0)
> >
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-- 
Greg Rippin, Graduate Assistant
Music Technology Program
New York University
35 West 4th Street, Suite 777
New York, NY 10012

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