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-   -   DiAna, a software Distortion Analyzer (https://www.diyaudio.com/forums/equipment-and-tools/315785-diana-software-distortion-analyzer.html)

Edmond Stuart 5th December 2017 04:41 PM

DiAna, a software Distortion Analyzer
 
3 Attachment(s)
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.

mbrennwa 5th December 2017 05:38 PM

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)?

Edmond Stuart 5th December 2017 06:27 PM

Quote:

Originally Posted by mbrennwa (https://www.diyaudio.com/forums/equipment-and-tools/315785-diana-software-distortion-analyzer-post5266572.html#post5266572)
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.

lemon 5th December 2017 07:14 PM

Nice software.
Unfortunately, not all RTX have been delivered yet.
When you are ready, give us a download link for the demo version.

Edmond Stuart 5th December 2017 11:04 PM

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.

cwtim01 5th December 2017 11:19 PM

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

davada 5th December 2017 11:28 PM

Edmond why did you choose the fast Hartley over Fourier?

Edmond Stuart 5th December 2017 11:34 PM

Quote:

Originally Posted by cwtim01 (https://www.diyaudio.com/forums/equipment-and-tools/315785-diana-software-distortion-analyzer-post5266870.html#post5266870)
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?

cwtim01 5th December 2017 11:48 PM

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.

stinius 5th December 2017 11:55 PM

Quote:

Originally Posted by Edmond Stuart (https://www.diyaudio.com/forums/equipment-and-tools/315785-diana-software-distortion-analyzer-post5266885.html#post5266885)
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.

Hilsen
Reodor


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