[Ardour-Users] Puzzling line level interference

Thomas G. Willis tom.willis at gmail.com
Fri Jul 27 20:31:41 PDT 2007

i see someone reported a similar problem 2 weeks ago. UGH I should read
better. So it sounds like ext usb sound card should do the trick at fixing
it and you all can ignore my message. Sorry for the distraction.

On 7/27/07, Thomas G. Willis <tom.willis at gmail.com> wrote:
> Hi all,
> I'm hoping someone can suggest remedies for this problem I'm having in
> doing laptop recording.Not necessarily ardour related
> Basically I got a really weird white noise-ish interference when I try to
> record through the line -in that seems to hover around 4db. Here's the
> strange part. If I unplug the ac adapter it goes away. So Basically I can
> record scratch tracks while running on battery (which lasts about an hour).
> I've also noticed that if I route from the line out jack into my Roland 8
> track I get an identical sounding hum/buzz that also goes away when I unplug
> the ac adapter.
> I'm almost certain this problem is isolated to my residence because I do a
> radio show off my laptop through the line out with ac adapter plugged in and
> there is no hum what so ever in the studio.
> Someone wondered if maybe it has something to do with the internet access
> that the energy company offers maybe. So I'm wondering if there's any way to
> filter the current out maybe through an extra fancy power stripor something
> so that I don't get the hum when I record.
> FWIW. It's a HP Pavillion dv9000(snd-intel-hda) running the latest ubuntu
> and whatever ardour is in their repositories.
> I'm getting an ext usb sound card delivered in a couple of days and I'm
> hoping that this helps but the problem is annoying.
> Any suggestions would be greatly appreciated.
> --
> Thomas G. Willis

Thomas G. Willis
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