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Can someone tell us what practical things you do with the free Praxis Post Processing features when used with results obtained from a different measurement program like Just MLS or any other non-Praxis measurement for that matter?
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oneoldude :later:
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Not really much use- it's great for post processing data from someone else's Praxis system.
I've done that with data from MarkK.
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Oh, I don't think it's that bad...Originally posted by JonMarshNot really much use- it's great for post processing data from someone else's Praxis system. I've done that with data from MarkK.
Basically, anything that's in an frd type format can be manipulated. It doesn't have to be a praxis file. You can export and manipulate your clio files. The operations are very broad and can be very sophisticated. For example, you can turn an FR curve into a waterfall, step, or impulse, get group delay if you've got measured phase available. Of course, usually the more postprocessing going on, the more error introduced.
You have to take a look at the manual, and you also have to think about what exactly, you want.Comment
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Load the FRD txt file and then process it with "Re-map To New Frequencies" postproc, with "FFT format" option. Then all the operations in the PostProcessing drop down menu are available for use. For instance if the FR txt file has logarithmic frequency intervals, Praxis won't IFFT it. Using "Remap to New Frequencies", the frequency intervals are adjusted to the FFT intervals by interpolation. Then IFFT can be used on it.
Similarly, when two Praxis windows have different FFT formats, like one being 512 point FFT the other 1024 point FFT, some binary operations will be disabled to be operated on them. In that case, one of the windows has to be "Re-mapped" to the FFT format of the other window.
There are a lot of things one can do with the Praxis postprocs. I use it quite often, it is intuitive, and displays the data nicely. The nice multicolor multi curve display alone is nice, especially to post the data to internet. Some basic things are filtering, smoothing, adding, subtracting, multiplying, dividing FR curves. If phase was in the FRD, as Mark mentioned, you can IFFT to get the impulse response. And from there, do all kinds of things like CSD, Step, ETC, Group Delay. Or re-FFT the impulse response with different window settings to see the effects, etc.Comment
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