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Frequency response calibration to an existing measure...
Frequency response calibration offset. I'd like to compensate for example, for a microphone response anomaly AFTER a measurement has been taken. A global frequency response offset that can be applied to any existing measurement. I know that this could be done by "multiple selection" using sum and difference but then I could not also do comparisons between two different measurements without losing the global offset I'd like to apply to both.
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Inappropriate?Bob, have you tried the time domain combine functions?
In particular, you could add and/or subtract signals in the time domain, which should be equivalent to doing it in the frequency domain.
This would make the application of the corrections more permanent, and allow you to do post-correction comparisons. -
Inappropriate?Thanks for the idea, Chris. Unfortunately, neither time domain add, nor subtract, nor average gives a correct result. The result seems to be smoothed out rather than a true combination like the frequency domain combine. But this brings up an idea. How about a frequency domain combine that's add or subtract? This would allow a correction to be applied to an measurement.
But this would soon become very tedious compared with having a permanent or semi-permanent frequency-response correction that can be applied to all measurements. -
Inappropriate?I think my question is similar.
Basically I am wondering if FuzzMeasure 3.1.1 is able to allow me calibrating a given loudspeaker / microphone setup, say in open air, mic 1m in front of speaker's hotspot. Then save and load this "calibration file" as a zero-reference for measuring room acoustics. I am missing this in a manual or cannot translate the used topology. If it IS possible, could you please describe this procedure step by step, so I can consider purchasing the product?
I kept it to long (+14 days) on my Mac, now that I wanted to have a closer look the demo mode expired, is this why the Time Domain Combine and Frequency Domain Combine are grayed out? Perhaps this is vital...
Thanks for taking your time to answer this.
Bas Meyer1 Comment
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Email support@supermegaultragroovy.com, and I'll send you a key to extend your trial.
Those menu items are grayed out because they will create more records than the document will allow (2 is the maximum past your trial period). That's one method to do the correction—with the frequency-domain combine.
The other method is to export the response as an FRD file, and then import it using the microphone calibration feature.
I think that the frequency-domain combination might provide a better result, but calibrating using the microphone calibration method I listed above would certainly be more convenient. -
Inappropriate?I'd like to second the request for what is essentially selecting -one- of many measurements in a FM file as a reference amplitude curve which can be
used to normalize a family of curves (multi-subtract? or multi-add).
I've attached an example plot that was manually edited in a graphics program to perform this function (individual differences vs. the reference curve plotted in FM, then graphically cut and added to a base plot ... not fun or pretty). I've not been able to successfully apply any of the combination or operation
functions (current or beta) to achieve this. Could be I'm doing something wrong.
-dave (3.2b5 user)1 Comment Add a comment
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When you created this, you used the multi-select mode to create these graphs, and then copied/pasted them into a graphics app to combine them?
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Inappropriate?Yes. The yellow, 15deg plot was what I started with... itself a multi-select
difference plot (vs a reference 0deg measurement) exported as a graphic. The 30 and 45deg series were similarly created, the trace/color selected, cut and pasted into the 15deg plot... admittedly, a bone-headed approach, but that is the information I wanted to display. Doing the same thing at 5deg intervals
would be tedious, as would exporting FRD's, cutting and pasting into another plotting program. -
Inappropriate?Have you tried exporting your reference measurement as an FRD file, and then importing that as a microphone calibration file? Does that give you reasonable results?
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Inappropriate?If one were to always plan ahead and never change the reference measurement, then that might be one solution. I did try selecting an exported FRD as a mic cal file, after the fact (not expecting it to work...
it didn't, in fact 3.2b5 "quit unexpectedly" when attempting a 2nd
measurement -after- importing the ref cal file [macos 10.6.1/32bit]). -
Inappropriate?If you can repro that, please gather the crash log (from ~/Library/Logs/CrashReporter) and the FRD file you exported so I can check that out—it should never crash.
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Inappropriate?sent.
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