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FRD export appears to double frequency of SPL data
Hello,
I've been doing a lot of driver measurements with Fuzzmeasure for loudspeaker design, but now in checking my work exporting FRD files to LspCAD, and viewing the files in TextEdit, the SPL data has been doubled in frequency- on all drivers when I export to FRD. So, if there's a peak in a midwoofer response on the SPL graph at 5 kHz and the response dives above that, that peak in the FRD file is at 10 kHz.
This is the only "Bug" I've ever found in this otherwise great program!
I've been doing a lot of driver measurements with Fuzzmeasure for loudspeaker design, but now in checking my work exporting FRD files to LspCAD, and viewing the files in TextEdit, the SPL data has been doubled in frequency- on all drivers when I export to FRD. So, if there's a peak in a midwoofer response on the SPL graph at 5 kHz and the response dives above that, that peak in the FRD file is at 10 kHz.
This is the only "Bug" I've ever found in this otherwise great program!
I’m frustrated
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Inappropriate?This is certainly strange. Could you also paste a graph from LspCAD which shows the FRD graph after being imported? I think it'd help to see what's going on graphically first.
In the actual code, I don't see any obvious way that the frequency is doubled, nor do I see the min/max frequency bounds (as set in the inspector) being taken into account for the FRD export.
Thanks for the investigation work—it'll certainly help track down what's going on. -
Inappropriate?John, can you let me know if you have a Frequency Range set on this measurement?
That is, in the inspector, expand the 'Frequency Range' area, and set both values to 0. Export again, and let me know if the values are correct.
You might have inadvertantly set a frequency range by measuring with a sweep that's limited to 20-20000Hz (rather than the default of 1Hz to nyquist).
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