HOLMImpulse: Measuring Frequency- & Impulse-Response - Page 80 - diyAudio
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Old 21st November 2012, 09:31 PM   #791
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How did you load the blue measurement? I'll try to replicate what you've done.
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Old 21st November 2012, 11:08 PM   #792
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Quote:
Originally Posted by Pano View Post
How did you load the blue measurement? I'll try to replicate what you've done.
go to menu File.....open (append) measurements ...
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Old 21st November 2012, 11:51 PM   #793
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OK, I tried it by opening (append) a file with one sweep in it. I get exactly the same FR, impulse and distortion as the original. They overlay perfectly.
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Old 22nd November 2012, 12:50 AM   #794
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Quote:
Originally Posted by Pano View Post
OK, I tried it by opening (append) a file with one sweep in it. I get exactly the same FR, impulse and distortion as the original. They overlay perfectly.
Please try exactly this procedure:
open the app
launch the test
save the test
don't touch anything and don't clear anything
now append the saved test and compare it with the real-time in A and the loaded test in B.
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Old 22nd November 2012, 03:39 PM   #795
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That's basically what I did, but will try again when I get a chance.
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Old 22nd November 2012, 06:01 PM   #796
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Originally Posted by Pano View Post
That's basically what I did, but will try again when I get a chance.

Have you set the DISTORTION as NOISE and not as THD ?

I tried several times, but below -92 dB the app does not save the curve correctly, i have a RME Fireface 800.
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Old 22nd November 2012, 11:31 PM   #797
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Here is a loopback measurement of my M-Audio card.
Procedure just as you specified. THD as noise
Yes, there is a tiny bit of difference in some spots, like 0.3dB, but nothing major.

When I set the ASIO driver to 24 bit depth and HOLM to save in 24 bit, the results are even closer.

Maybe it's something in your settings? Maybe the .net framework?
Attached Images
File Type: png Holm-loop.png (18.3 KB, 126 views)
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Old 23rd November 2012, 12:58 AM   #798
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Here ?
Thanks Pano, but in your chart the Hz from 0 to 40 not fall below 90 dB and then you do not see this little problem...
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Old 23rd November 2012, 01:01 AM   #799
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No, I don't. But my graph is much closer than your results for the rest of the range. I suspect you have a problem with Windows or the .net framework.
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Old 23rd November 2012, 01:08 AM   #800
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Oh, I just discovered something strange. If I start the graph lower, like 2Hz, the distortion displays lower. Odd.... will do some testing and report back.
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