[PD] 0 latency

[Jaime Oliver]

15-20 ms should be perceptually enough (visual-sound or motor-sound), some
people put it at 40, but a percussionist would definitely notice it. I
suppose one has to learn it and make it part of the instrument, latency in
an acoustic piano can be as high as 100ms...

But the problem is that the pad probably makes a noise, and the perceptual
latency for two sounds to fuse is not more than 5ms...

J

On Sat, Dec 27, 2008 at 12:00 PM, Lao Yu <noise.now at gmail.com> wrote:

> Zero latency is a marketing slogan but it is physically impossible.
> the only way to have something close to that would be monitoring
> BEFORE the AD converter. even a stand-alone digital tape recorder has
> a few ms of latency simply caused by A/D and then D/A conversion.
> reducing the sample rate doesn't change the latency. but Frank said
> all that already.
> you need to find latency in the settings of your interface. in pd you
> set the latency in the 'delay' value of the audio settings dialog or
> in the settings of jack (I don't know which you use). The default is
> 50ms which is too high for my taste for life music. The lower your
> latency setting the higher the CPU load. Set it to a time value that
> you can accept without pulling too much power out of your machine.
>
> Best
> Jurgen
>
> On Dec 28, 2008, at 12:11 AM, Frank Barknecht wrote:
>
> > Hallo,
> > Juan Felipe Mejia hat gesagt: // Juan Felipe Mejia wrote:
> >
> >> hi everyone, im a beggining to work with Puredata and a TD 9
> >> Roland v-
> >> drums.
> >> I'm using a MOTU ultralite mk3 as my in-out audio divice.
> >> I work with a MacBook Pro, 2.5 Ghz Intel core duo, 4 GB of ram.
> >>
> >> Until now almost everything is working properly but the latency.
> >> Does anyone now how to get the 0 latency en puredata?
> >
> > Zero latency is impossible in a computer software if you do some
> > processing of the incoming data before sending it out again.
> >
> >> i've tried to reduce the sample rate to 30000 and even lower, the
> >> same
> >> with the delay but there is still some latency.
> >> Lower than 30000 works better but the sound quality is bad.
> >
> > Generally latency shrinks with higher samplerates and gets larger with
> > lower rates, provided you have the same blocksize.
> >
> >> I tried AudioDesk (the software that comes with the MOTU) to make
> >> some
> >> live recordings and there were no delay, no latency.
> >
> > Probably the soundcard is sending incoming data straight through,
> > so no
> > processing is going on. Otherwise see above: Technically 0 latency is
> > impossible.
> >
> > Ciao
> > --
> > Frank
> >
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-- 
Jaime E Oliver LR

joliverl at ucsd.edu
www.realidadvisual.org/jaimeoliver
www-crca.ucsd.edu/
www.realidadvisual.org

858 202 1522
9168 Regents Rd. Apt. G
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