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Old 26th May 2012, 05:02 PM   #21
Pano is offline Pano  United States
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Nice find!
Google Translate did a pretty good job on this PDF
http://casa.accattatis.org:9090/Arti...yser_part1.pdf
But I had to download it then choose it from Google Translate. All images were gone, but the text is pretty good. There may be a better way.
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Old 26th May 2012, 09:14 PM   #22
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Was just doing some vibration analysis with VA and fooled around with the DC Removal. With my EMU-0202 I get a rise in the spectrum down at a few Hz. This is regardless of signal or not. With the gain on the EMU set to minimum, everything (the noise floor) is at about (uncalibrated) -130 dB. The far left end is at about - 90 dB. If I click the DC Removal, the left end goes to the same, or a bit lower, than everything else. IMO, there's some tiny offset in the EMU at the -90 dB level, that the program can filter out. AFAIK, one could remove all the AC coupling from a sound card and get it to go to DC, except for the fact that it probably runs single supply and you'd have to supply an offet.
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Old 26th May 2012, 11:27 PM   #23
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It certainly would be helpful to have a fluent Italian speaker on the case, not necessarily to translate the articles (although that would be great and would probably get me off the hook entirely!), but at least to search out issues such as how to interpret A cross B. Any offers, or do we know any Italian speaker members we could lean on? My Italian is largely limited to the culinary and musical.

On the A cross B issue, Simon B has also raised doubts (in a private email). He also wonders if it is some sort of cross correlation feature. We'll have to think out how to test that theory, unless someone can find it in the Italian.

Ah, Pano, I now see your recent post. I tried to convert this article via Google Translate, but when I tried to copy from the .pdf, I got an internal error message. Suggestions?

Ah, wait, I found I could copy it as text, and then import the text into Translate. Unfortunately, I think this all relates to the 2011 or earlier versions, and the A cross B feature wasn't in them. But we can probably use it to crack other conundra. Thanks, Pano.

Terry

Last edited by Terry McGee; 26th May 2012 at 11:36 PM. Reason: Update
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Old 26th May 2012, 11:41 PM   #24
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Just shot off a request to Dario Inserra to come and play. Viva Italia !
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Old 27th May 2012, 12:46 AM   #25
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Quote:
Originally Posted by Terry McGee View Post
It certainly would be helpful to have a fluent Italian speaker on the case, not necessarily to translate the articles (although that would be great and would probably get me off the hook entirely!), but at least to search out issues such as how to interpret A cross B.
Hi Terry,

I'm not an expert on measurement tools (I don't have an oscilloscope too) but if you tell me what is your doubt and possibly point me to the italian manual I'll do my best to help.

Dario
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Old 27th May 2012, 07:38 PM   #26
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It's been long enough that I can post this. Haven't tried it on the latest versions, but just put the text into a notepad file and name it something like A_weighting.cmp


;A-weighting
20 50.4
25 44.8
31.5 39.5
40 34.5
50 30.3
63 26.2
80 22.4
100 19.1
125 16.2
160 13.2
200 10.8
250 8.7
312 6.7
400 4.8
500 3.2
625 2.0
800 0.8
1000 -0.0
1250 -0.6
1600 -1.0
2000 -1.2
2500 -1.3
3120 -1.2
4000 -1.0
5000 -0.6
6250 0.1
8000 1.1
10000 2.5
12500 4.3
16000 6.7
20000 9.3
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Last edited by Conrad Hoffman; 27th May 2012 at 07:40 PM.
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Old 27th May 2012, 07:43 PM   #27
Pano is offline Pano  United States
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How would you use that with V-A? And could a microphone calibration be entered the same way?
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Old 27th May 2012, 07:44 PM   #28
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I haven't used or checked this one yet-

;C-weighting
20 6.2
25 4.4
31.5 3.0
40 2.0
50 1.3
63 0.8
80 0.5
100 0.3
125 0.2
160 0.1
200 0.0
250 0.0
312 0.0
400 0.0
500 0.0
625 0.0
800 0.0
1000 0.0
1250 0.0
1600 0.1
2000 0.2
2500 0.3
3120 0.5
4000 0.8
5000 1.3
6250 2.0
8000 3.0
10000 4.4
12500 6.2
16000 8.6
20000 11.3


There should be a subdirectory called Frequency Compensation. Put 'em in there and select it as microphone compensation under spectrum. I think the program installs with some standard mic compensations for SM57, SM58 and others. You'd have to combine compensation for a specific mic and the weighting if you wanted both. That probably means using fewer points for the weighting (yecch) or interpolating on the mic curve, since most people don't have hi res data on their mics. Mics are pretty flat, so it might be easy. IMO, VA makes a great little acoustic analysis program when combined with a mic.
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Last edited by Conrad Hoffman; 27th May 2012 at 07:51 PM.
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Old 27th May 2012, 09:01 PM   #29
Pano is offline Pano  United States
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Yep, that worked and was very easy. I just took my mic cal file and made a copy in the same folder as VA. Changed the extension to .cmp and loaded it in. So far, so good. I didn't even remove the phase column.

I do now see that the furthest left bar is way up. Turned on DC remove and it's gone. Will check further.
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Old 27th May 2012, 11:15 PM   #30
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Quote:
Originally Posted by ClaveFremen View Post
Hi Terry,

I'm not an expert on measurement tools (I don't have an oscilloscope too) but if you tell me what is your doubt and possibly point me to the italian manual I'll do my best to help.

Dario
Hi Dario. Thanks for your offer of help!

I'm not sure if there is an Italian manual. But we do know that there are some papers, as identified by mickeymoose:

http://casa.accattatis.org:9090/Arti...0on%20VA/?date

And the articles in Nuova Elletronica at the right hand side of:

Visual Analyser 2011 XE

If you could have a flick through these and see which ones have any practical information, we could concentrate on them in future.

Some of them may be able to be translated into English using the Google translator. Let us know of any that you think could be translated (eg clean text) and would be useful.

Terry
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