Re: Spikes when recording

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That seems pretty regular at 8 to 10 minute intervals.  Do you live
near a subway line?  Or other electric mass transit option?  Is the
computer on a UPS or power conditioner type supply line?  I get a
spike like that when I use a battery box to power an electret mic.  If
I turn it on after pressing record.  Beyond that, your guess is as
good as mine.

- James


On 5/20/11, Peter Hoffmann <ph@xxxxxxxxxxxxxxxxxx> wrote:
> Hello,
>
> I'm recording audio 24/7 with a delta 1010 sound card and have a
> strange problem:
>
> Every night at 2:30 I get spikes and some inaccurancy within some
> seconds in a one hour length recording. I've upload a screenshot to
> illustrate the problem:
>
> http://img88.imageshack.us/img88/4562/spikesh.png
>
> My .asoundrc
>
> pcm.capt {
>         type dsnoop
>         ipc_key 223456
>         slave {
>                 pcm "hw:0,0"
>                 rate 8000
>                 period_time 0
>                 period_size 320
>                 channels 12
>                 format S32_LE
>         }
> }
>
> pcm.c1 {
>      type plug
>      ttable.0.0 1
>      slave.pcm capt
> }
>
> pcm.c2 {
>      type plug
>      ttable.0.1 1
>      slave.pcm capt
> }
>
> pcm.c3 {
>      type plug
>      ttable.0.2 1
>      slave.pcm capt
> }
>
> pcm.c4 {
>      type plug
>      ttable.0.3 1
>      slave.pcm capt
> }
>
> pcm.c5 {
>      type plug
>      ttable.0.4 1
>      slave.pcm capt
> }
>
> pcm.c6 {
>      type plug
>      ttable.0.5 1
>      slave.pcm capt
> }
>
> pcm.c7 {
>      type plug
>      ttable.0.6 1
>      slave.pcm capt
> }
>
> pcm.c8 {
>      type plug
>      ttable.0.7 1
>      slave.pcm capt
> }
>
> I'm recording with arecord -q -f cd -t wav -d 3600 -c 1 -D c1 out.wav.
>
>  Any hints where the problem might be?
>
> Kind Regards,
> Peter Hoffmann
>
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------------------------------------------------------------------------------
What Every C/C++ and Fortran developer Should Know!
Read this article and learn how Intel has extended the reach of its 
next-generation tools to help Windows* and Linux* C/C++ and Fortran 
developers boost performance applications - including clusters. 
http://p.sf.net/sfu/intel-dev2devmay
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