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Artifacts/dropouts Win7/console/sir1 setup Help?
Artifacts/dropouts Win7/console/sir1 setup Help?
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Old 8th December 2009, 08:01 PM   #1
JonHag is offline JonHag  Denmark
diyAudio Member
Join Date: Jun 2009
Default Artifacts/dropouts Win7/console/sir1 setup Help?

I am very sorry if my issue has been discussed else where. I couldn't find an answer by searching.

My problem is that while playing back audio, there is sometimes small disturbances in the sound. Like very short pauses.

My setup:
PC with win7 (also had the problem with XP)
Console VST-host running asio
SIR1 VST convolver (fir filter 1000 taps) 4 instances
Mediaplayer (problem also existent with foobar)

My setup is 2-channel, so i am doing convolution on 2xtweeter and 2xwoofer.
Sound card is lynx-twoB. I use a jumper to route back pc-application audio to the lynx-mixer in order to pass all audio thru console.
In console there is a CPU load indicator wich usually reads a total of ~3% but sometimes it jumps to 50-100%. This is sometimes, but not always, related to the sound disturbances. These CPU-jumps are not seen on windows task-manager performance monitor!?! I guess this is averaged for a longer period of time.
The problem happens both when playing back music from the HD, and from the cd-rom drive, but i am not sure if it happens of equal frequency.

So, any idear of where to look?

And thanks very much in advance for your time.

Regards, Jon.
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Old 10th December 2009, 07:12 PM   #2
1audio is online now 1audio  United States
diyAudio Member
Join Date: Mar 2004
Location: SF Bay Area
Artifacts/dropouts Win7/console/sir1 setup Help?
You are probably running into internal underruns, i.e. the system running out of data. If the system isn't carefully optimized any of a number of background tasks can suddenly bump the audio thread. And the filters you are using may also have some periodic demands that don't show. Sysinternals has a more comprehensive toolset for looking at internal loads.
Demian Martin
Product Design Services
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Old 10th December 2009, 10:55 PM   #3
wwenze is offline wwenze  Singapore
diyAudio Member
Join Date: Mar 2008
You might want to use task manager to see which program is causing the CPU load

Also you can try this:

DPC Latency Checker
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Old 11th December 2009, 09:07 AM   #4
phofman is offline phofman  Czech Republic
diyAudio Member
Join Date: Apr 2005
Location: Pilsen
In case you do not need to keep latency low, you can raise ASIO buffers to give your system more time headroom.
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