How can I calculate which is the index (x-value) correspondant to a certain value of a signal?
I just want to calculate the quality of the peak in a FFT, defined as you can see in the attached file.
For that, I would need to know how can I calculate in Labview the index or indices (x-value) correspondant to a certain amplitude value of the function.
Kind regards, and thank you for reading,
Jose
Solved!
Go to Solution.
Attachments:
quality.jpg 6 KB
If you know the lineshape (e.g. Lorentzian), you can use nonlinear fit. This will give you the most accurate value.
In the most simple case (insignificant offset and noise, no other peaks) you can apply the following code (if there are other peaks, then take a apropriate array subset before applying the code). To get correct units, just scale with df.
LabVIEW Champion . Do more with less code and in less time .
Attachments:
WidthAtHalfHeight.png 52 KB
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