Peter,
by recording do you mean recording audio using the line in [blue] or the
mic in [pink] jack on the HP MB.
Some have dual Line/Mic input arrangements.
alsamixer will tell you a lot about your situation. Make sure the record
inputs are set at minimum.
The MIC input has DC available for electret microphones which you can
avoid by using a stereo [tip, ring, sleeve] jack sending audio on the
tip and sleeve.
This needs to be sent at low level [-50db] if this is the input you are
using. High level will cause the drop out's you describe.
Line level input is possibly -10db which is a lot less than most mixers
put out. Typically they are +4db.
again high level is likely to block the input.
A T pad made from 2 x 680 ohm resistors in series with a 330 ohm shunt
from the centre [of the 2 x 680's] to ground will reduce the mixer out
line in enough to get you in to manageable territory.
I use small transformers to isolate the mixer from the PC to avoid
ground loops.
The 'on board' sound on most PC motherboards is average at best, and
while HP tends to be better than most, you are dependent on which MB you
have, and the condition of the power supply.
What exactly are you recording? Are you close to a transmitter? How good
are the cables between the audio source and the record in?
regards
Robert
On 23/11/19 11:32 PM, Peter Claes wrote:
Hi guys,
I have been busy setting up clients for our rivendell 2.19 system on
Centos 7.
The clients are all small HP pc's
Everything works just fine, database, playback, filesystems, etc.
I did had to sate 'rate 48000' in the asound file, to get it
working properly.
The only problem that I am facing is some kind of dropped samples,
when I am recording. As if there are skipped samples in the audio.
which is getting worse at higher volumes
At first, I thought it is due to the fact that the HP pc's are older
models, so I tested it on some post 2010 PC's .. There is still that
same problem.
I have been looking for what the problem might be, so people suggested
it might be an IRQ problem. So I changed IRQ's in BIOS, but in
RdAlsaconfig there is always a different IRQ nuimber as to what I have
set in the BIOS. Is this normal behaviour ?
Other people suggested that for HDA audio devices, the sampling is not
done via an IRQ, but through a timer. But I have no clue what they are
talking about, nor how to fix this.
Is there anyone who has been battleling that same problem ?
Regards
Peter
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