Subject: [linux-audio-user] Non-xrun noise with ALSA, Jack and an USB soundcard
From: Jorma R (rjorma_AT_jippii.fi)
Date: Wed Apr 14 2004 - 10:24:00 EEST
Hi,
I wonder if this is normal...
I get a lot of noise - clicks and pops - when connecting Jack ports. The
noise appears when I run Jack in duplex mode and with a period size less
than 2048 frames.
I get no noise if I run Jack with playback only.
If I for example run Hydrogen and connect its ouput ports to alsa_pcm
playback ports I get noise when in duplex mode but no noise when in
playback only.
The strange thing is that I get no xruns when the noise appears. I do
not run out of CPU power either - the CPU usage is down to about 10%
when running Jack and one client for example.
What I want to do is to record 24-bit audio with my Emagic Emi 6|2m USB
audio box. I can do this at the moment - the captured audio is clean and
I can use the hardware monitoring to monitor what is being captured.
Naturally I would like to get rid of the noise as well to take full
advantage of what the box should be capable of.
I could simply run Jack with 24-bit capture and with a period size of
2048 or more but Jack refuses to start with such settings.
Should I just accept the situation as a fact or is there something I
could do to get rid of the noise when running Jack in duplex mode and
with 24-bit samples?
The Kernel I am using is a 2.4.25, Alsa is 1.0.3 and Jack is 0.94 all
from from PlanetCCRMA.
The hardware should be irrelevant - the same problem appears in 3
different computers I have tried ranging from a Celeron 700 to a P4 2.4
Ghz.
Ideas, anyone?
Br,
-Jorma
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