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DiAna, a software Distortion Analyzer
DiAna, a software Distortion Analyzer
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Old 28th June 2018, 05:31 PM   #561
1audio is offline 1audio  United States
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DiAna, a software Distortion Analyzer
The cal routine worked quite well. Some of the settings were counter-intuitive. I had to set the source value to .075 to get a non-clipping source but after that all has been OK. With the RTX on 10V setting 5V gets 5.004V and that's with less than ideal metering. Are these cal settings stored with the soundcard selections?
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Old 28th June 2018, 05:35 PM   #562
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Looks like you have some 60 Hz PS noise getting in there, but your are in a 50 Hz power country. Also more higher harmonics? I'm sharing my settings in case they are useful.
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Old 29th June 2018, 12:32 PM   #563
Edmond Stuart is offline Edmond Stuart  Netherlands
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Default Calibration

Quote:
Originally Posted by 1audio View Post
The cal routine worked quite well. Some of the settings were counter-intuitive.
Perhaps at first sight, but ....
Quote:
I had to set the source value to .075 to get a non-clipping source but after that all has been OK.
That's as expected with the RTX set at 10V and an initial cal factor of 'only' 1.0 (instead of 10.0).
Quote:
With the RTX on 10V setting 5V gets 5.004V and that's with less than ideal metering. Are these cal settings stored with the soundcard selections?
Not yet, but that would be a handy feature. On the other hand, what if the RTX setting has been changed to 1V? Then the cal. factors are invalid.
At present, you only can save or load the parameters of a specific sound card via the File pull-down menu -> Save Configuration or Load Configuration.

Thanks for testing.

Cheers,
E.
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Old 29th June 2018, 12:37 PM   #564
Edmond Stuart is offline Edmond Stuart  Netherlands
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Quote:
Originally Posted by 1audio View Post
Looks like you have some 60 Hz PS noise getting in there, but your are in a 50 Hz power country. Also more higher harmonics? I'm sharing my settings in case they are useful.
Perhaps the noise is coming from my monitor which is refreshed at 60Hz.
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Old 29th June 2018, 03:59 PM   #565
1audio is offline 1audio  United States
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Quote:
Originally Posted by Edmond Stuart View Post
Perhaps at first sight, but ....
That's as expected with the RTX set at 10V and an initial cal factor of 'only' 1.0 (instead of 10.0).
Not yet, but that would be a handy feature. On the other hand, what if the RTX setting has been changed to 1V? Then the cal. factors are invalid.
At present, you only can save or load the parameters of a specific sound card via the File pull-down menu -> Save Configuration or Load Configuration.

Thanks for testing.

Cheers,
E.
If you can implement reading from the RTX settings that would be compensated for. Meanwhle the RTX is very much an odd unit in this respect. Pretty much all soundcards have one setting (or maybe two for the pro cards, -10 and +4)

I wonder how the vertical refresh would be getting to the soundcard.
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Old 29th June 2018, 04:34 PM   #566
Edmond Stuart is offline Edmond Stuart  Netherlands
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Quote:
Originally Posted by 1audio View Post
If you can implement reading from the RTX settings that would be compensated for. Meanwhle the RTX is very much an odd unit in this respect. Pretty much all soundcards have one setting (or maybe two for the pro cards, -10 and +4)
I'm already busy with the implementation of saving and loading the cal. factors, not only automatically, but also manually. In case of the latter one can use different filenames in order to distinguish the various settings.
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I wonder how the vertical refresh would be getting to the soundcard.
Me too. But when I lay the Lynx cable along the one to the monitor, I get more "grass" (6dB at 60Hz).

Cheers,
E.
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Old 29th June 2018, 06:18 PM   #567
1audio is offline 1audio  United States
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Can you explain coherent spectrum vs. incoherent spectrum?
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Old 30th June 2018, 10:06 AM   #568
Edmond Stuart is offline Edmond Stuart  Netherlands
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Default Calibration factors

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Originally Posted by 1audio View Post
[...]Are these cal settings stored with the sound card selections?
Hi Demian,

A new version (1.51.10) takes care of that. The cal. factors are automatically stored (and loaded) in a separate file with the name of the ASIO driver plus a .cal extension.
In case of sound cards with more than just one setting, you can save (or load) the cal file under another name via the file pull-down menu, see pic.

Cheers,
E.
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Old 30th June 2018, 10:39 AM   #569
Edmond Stuart is offline Edmond Stuart  Netherlands
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Quote:
Originally Posted by 1audio View Post
Can you explain coherent spectrum vs. incoherent spectrum?
These two spectra differ in the way how the individual FHT's of each record are summed together. In case of a incoherent spectrum, the power spectrum is simply based on averaging the power of the individual FHT's, while in case of the coherent spectrum, the phase of the fundamental and its harmonics is also taken into account. In this way the noise is averaged out (to a certain extent) and harmonics who were otherwise buried in noise become visible.

Cheers,
E.
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