[ardour-users] good system...but crackling in audio?

Eric ej at ir.iit.edu
Mon Jun 14 07:54:08 PDT 2004

I used to have a similar crackling problem caused by my old Voodoo3
PCI video card on my dual athlon system.  The crackles were directly
related to redrawing the screen when i moved windows, etc., and were
even worse if I didn't have my X server running in accelerated mode.
I replaced it with an AGP one and that solved the crackling.  It seems
that PCI bus activity can really screw stuff up...at least on dual
Athlons with Delta cards (mine is a 66), not sure if this is a
universal difficulty.  I still suspect my PCI SCSI controller of being
part of the reason why I can't really operate on latency lower than -p
256 -n 3...not sure whether IDE would solve that or not since it hangs
off the athlon's PCI bus too.


On Sun, Jun 13, 2004 at 09:02:55PM -0500, Anthony wrote:
> * Jeremy M. Booth <bq20 at comcast.net> [Jun 13 04 19:59]:
> > really?  What do you mean by a "lot" of network activity...running an
> Sustained downloading only. Again, I have no idea if your crackling is
> my crackling of course. Its a quiet noise signal but a persistant, well umm
> crackling. Its an ASUS board dual athlon-mp, 3com controller. It didn't
> used to happen, my suspicions are I either moved the cards when cleaning
> a while back or it occurred with a kernel upgrade. BTW, have you 
> tried recording it? My noise can not be recorded, i.e. if I playback
> a recording of a noisy signal on my other card it sounds fine. 
> It was such a pain to diagnose, I felt sure it was my external gear
> or a bad DAC. But its absolutely related to network traffic, 100%
> sure.
> --ant
> > instant messaging client, or a download, or a remote X session?  What
> > kind of system are you running? What network devices?  The "crackling" I
> > get sounds like clipping, but according to the meters I have some
> > headroom to spare.  I'm beginning to think it might be a summing issue
> > or the metering isn't fast enough to show some fast transients that
> > could be clipping.
> > 
> > On Sun, 2004-06-13 at 19:05, Anthony wrote:
> > 
> > > I'm not sure what you mean by crackling, but I get distortion
> > > on my delta when there is a lot of network activity.
> > > 
> > > --ant
> > 
> > 
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