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DiAna, a software Distortion Analyzer
DiAna, a software Distortion Analyzer
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Old 5th December 2017, 03:41 PM   #1
Edmond Stuart is offline Edmond Stuart  Netherlands
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Default DiAna, a software Distortion Analyzer

Now that all the RTX 6001 have been shipped (and delivered?) it seems to me the right moment to "go public" with a free demo version of DiAna. For those who never heard of DiAna, it's a software tool (in conjunction with a ASIO sound card) to measure distortion (THD+N and THD-N). The pro version also measures IMD and the frequency response. Furthermore, the demo version is a bit crippled in that recording of the signal and data processing has been slow downed (i.e. separated into two steps). As an example, please, see below the loop back results of a Lynx L22 sound card.
As for the lower part of the pictures:
1st. graph: Spectrum of the harmonics only.
2nd graph: Full spectrum with coherent integration (averaging).
3rd graph: Full spectrum with incoherent integration.
As for the upper part all pictures: green is input signal, yellow is residual.
(the height of upper and lower part can be varied at will, of course)
For more details, please send a PM.
Cheers, E.
Attached Images
File Type: jpg THD-harm.jpg (100.7 KB, 3577 views)
File Type: jpg THD-coherent.jpg (113.7 KB, 3537 views)
File Type: jpg THD-incoherent.jpg (111.3 KB, 3420 views)
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Old 5th December 2017, 04:38 PM   #2
mbrennwa is offline mbrennwa  Switzerland
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DiAna, a software Distortion Analyzer
How does this determine the residual? Regression from a fit of the input to the output signal (fitting amplitude and time lag)?

Also, will DiAna work on non-Windoze systems (Linux, Macs)?
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Old 5th December 2017, 05:27 PM   #3
Edmond Stuart is offline Edmond Stuart  Netherlands
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Quote:
Originally Posted by mbrennwa View Post
How does this determine the residual? Regression from a fit of the input to the output signal (fitting amplitude and time lag)?
The residual is obtained by subtracting a pure sine from the (coherent integrated) input signal. In order to remove HF rubbish, you can low-pass filter the residual. This is done by means of an FFT and inverse FFT (BTW, actually, I'm using FHT's)
Quote:
Also, will DiAna work on non-Windoze systems (Linux, Macs)?
Nope, only under 'windoze'. Regarding other systems you might try to run it on an emulator. Probably it works, as DiAna only makes use of standard Win32 calls (no MFC rubbish).
One more important thing: DiAna is not just a spectrum analyzer, instead, it's a distortion analyzer.
Cheers, E.
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Old 5th December 2017, 06:14 PM   #4
lemon is offline lemon  Greece
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Nice software.
Unfortunately, not all RTX have been delivered yet.
When you are ready, give us a download link for the demo version.
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Old 5th December 2017, 10:04 PM   #5
Edmond Stuart is offline Edmond Stuart  Netherlands
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Default DiAna

The file itself can be downloaded at www.data-odyssey.nl/diana/ (not Index of /diana/)
and a few hints to get started can be found at: DiAna
Documentation and help files will come later.

Good luck.

Cheers, E.
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Old 5th December 2017, 10:19 PM   #6
cwtim01 is offline cwtim01  Hong Kong
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I got this error clicking the download link:
This site canít be reached

www.data-odyssey.nlís server DNS address could not be found.
DNS_PROBE_FINISHED_NXDOMAIN
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Old 5th December 2017, 10:28 PM   #7
davada is offline davada  Canada
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Edmond why did you choose the fast Hartley over Fourier?
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Old 5th December 2017, 10:34 PM   #8
Edmond Stuart is offline Edmond Stuart  Netherlands
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Quote:
Originally Posted by cwtim01 View Post
I got this error clicking the download link:
This site canít be reached

www.data-odyssey.nlís server DNS address could not be found.
DNS_PROBE_FINISHED_NXDOMAIN
That's weird. On my PC it does work. Are you sure no https:// is (automatically) added to the link? How about the other link? Also an error msg?
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Old 5th December 2017, 10:48 PM   #9
cwtim01 is offline cwtim01  Hong Kong
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I got the same error message with both links, and there is no https:// added.

The domain data-odyssey.nl is resolvable from online DNS portals, so it's probably something to do with my ISP. Given some behavior I've seen, it seems like my ISP is purposely hiding/blocking this site.

Last edited by cwtim01; 5th December 2017 at 10:54 PM.
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Old 5th December 2017, 10:55 PM   #10
stinius is offline stinius
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Quote:
Originally Posted by Edmond Stuart View Post
That's weird. On my PC it does work. Are you sure no https:// is (automatically) added to the link? How about the other link? Also an error msg?
Everything works fine for me.

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