Measurement distortion

Wylandright206

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So I recently purchased a new interface for portable measurements and when I went to take a calibration measurement I noticed some very strange behavior from this new device. There are these random blips that show up in the magnitude that don't appear to follow any pattern. I tried this with 2 other interfaces and I realized they had the same problem. Now when I swapped computers, the problem went away with all 3 interfaces. Any idea what this might be? It's a fairly new laptop with up to date drivers.
 

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John Mulcahy

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Those are caused by dropouts in the audio data. If you are using ASIO drivers setting the buffer size to its maximum may fix it, otherwise there may be other tasks running which are pushing REW into the background long enough to miss an audio data block. Interface manufacturers have suggestions for setting up PCs, here is Focusrite's, for example, and here is one from Presonus.
 

Wylandright206

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I've gone through and tried everything suggested on both of these threads short of reinstalling windows, with no luck. It's a dell laptop so maybe it's something dell has done? I'm totally stumped.
 

Wylandright206

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I tried turning off the Bluetooth and wifi, as well as disabling the drivers with no luck. Dang this is quite a mystery.
 

John Mulcahy

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You could try using Latencymon to see if there is some process causing issues. You could also try adding a "Run with priority" context menu and run REW with a higher priority, but that requires downloading registry files which can be difficult as such downloads are often blocked for security reasons. I have not tried the run with priority link and cannot vouch for the veracity or safety of the files in the link.
 

Wylandright206

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Thank you for recommending latencymon! I discovered a thermal throttle I applied in the bios was messing with the audio. That was dells only way of preventing this device from throttling at 100°c (not an infrequent occurrence under heavy load). That's not great for any piece of silicon but I guess I'll just have to deal with it.

I can't recommend dell for a number of reasons this is just one of them. Leaving us stuck with windows modern standby and hibernate, with bios locks is also a crime. Who in their right minds wants their laptop to wake itself in your bag, and then slam into 100°c until the battery is dead. It'll destroy your laptops screen and silicon, and your device is also DOA. This isn't a problem unique to dell, however if they would have enabled all of the sleep states you could simply opt out of WMS.
Sorry I'll get off my soap box 😆 thanks again!
 
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