linuxaudio.org

Justin Smith wrote:

quoted text
> On Tue, Jan 13, 2009 at 12:53 AM, david  wrote:

>> Is it normal for it to have more-or-less constant low-frequency pops and

>> crackles while playing quiet passages, and occasional louder pops even

>> in louder passages? These are files that were digitally generated

>> (sample recordings of the Aeolus organ synthesizer) or ripped from CDs,

>> so they weren't analog recordings that might have such additional

>> natural sounds.

>>

> Try the "test audio and midi" menu item in puredata, with the test

> signal on the "-40" setting (or some other low level reference signal

> of your choosing). If you get the same low frequency pops and static,

> it is your sound card or driver (most likely the card). From your

> description it could be a ground loop - does it go away if the sound

> card is attached to a laptop on battery power?

Thanks for the suggestion about it being a ground loop. I tried it at

home here with the laptop on battery power - with no change.
At my office, there was no noise problem at all.
The difference is that at home I was plugging the card into an powered

external USB hub (ZoneNet 7-port USB2). I reshuffled USB connectors to

give the sound card its own USB port and the noise went away.
Lovely sounding card - amazing how the Intel HDA sound chip makes the

sound muddy, murky and distorted ...
--

David

gnome@hawaii.rr.com

authenticity, honesty, community

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