[icecast] stream sounds like poo for no apparent reason

[Benninghoff, John]

Sorry, here is a link to more information.

http://www.epanorama.net/documents/groundloop/index.html

-----Original Message-----
From: Benninghoff, John 
Sent: Wednesday, April 24, 2002 2:28 PM
To: 'icecast at xiph.org'
Subject: RE: [icecast] stream sounds like poo for no apparent reason

<p>This does sound like a grounding problem. My (limited) understanding is that when you have 2 audio components plugged in to different outlets, there can be a voltage differential between the ground on the 2 devices, which will create an electrical flow between the 2 components, which is the source of the hum. I have had this problem before and solved with a ground loop isolator, (from Radio Shack) which somehow blocks the flow, and is cheaper than a mixer. I would guess that a mixer has something like this built in.

There are other possible causes for this, but I would also suspect that it is not a computer problem, but a physical problem.

-----Original Message-----
From: Samuel Hathaway [mailto:hathaway at munkynet.org]
Sent: Wednesday, April 24, 2002 2:16 PM
To: icecast at xiph.org
Subject: Re: [icecast] stream sounds like poo for no apparent reason

<p>On Wed, 24 Apr 2002, Samuel Hathaway wrote:

> On Wed, 24 Apr 2002, Alex Walker wrote:
>
> > On Tue, Apr 23, 2002 at 01:16:34AM -0400, jim wrote:
> > > here at wkdu.org our minds are blown trying to figure out what our
> > > problem is, we are using a dell optiplex gx1 with a soundblaster live
> > > card. we are getting a nasty hum on the line in.  the thing is we plug
> > > a cd player directly into the soundcard the hum goes away and when we
> > > plug the line in into anything else there is no hum, so the question i
> > > ask where is the hum coming from?  we are completely boggled.  we are
> > > using the latest version of iceccast along with darkice.7.....if this
> > > wasnt enough i have a a lit paper due tomm that has made my head hurt
> > > on top of this......
>
> Hmm, since no other audio sources produce a hum, I'd suspect the line from
> your board or something, not a computer problem. We at WRUR (wrur.org)
> have a really long run from the front of the studio to the room with the
> servers, and there's a hum.
> -samuel

Hmm, I may have read your post wrong. Are you saying that when you plug
the line from the studio into another amp (or something) you don't get the
hum? If so, it might be a grounding issue in the sound card. If you have a
mixer lying around, plug the line from the studio into it and then run the
output from the mixer to the sound card.
-samuel

by the way, my friend dennis's friend kelly is a dj there i think. heh.

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