Hi, The computer is on a UPS. The image is just cutout from a whole hour. I'm recording 24 x 1 hour per day. 23 hours are fine without spikes, but at always the same time at 2:30 such spikes occur. Kind Regards, Peter On Fri, May 20, 2011 at 5:22 PM, James Shatto <wwwshadow7@xxxxxxxxx> wrote: > 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 >> >> ------------------------------------------------------------------------------ >> 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 >> _______________________________________________ >> Alsa-user mailing list >> Alsa-user@xxxxxxxxxxxxxxxxxxxxx >> https://lists.sourceforge.net/lists/listinfo/alsa-user >> > > ------------------------------------------------------------------------------ > 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 > _______________________________________________ > Alsa-user mailing list > Alsa-user@xxxxxxxxxxxxxxxxxxxxx > https://lists.sourceforge.net/lists/listinfo/alsa-user > > ------------------------------------------------------------------------------ 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 _______________________________________________ Alsa-user mailing list Alsa-user@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-user
