c111
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@dsp_user my next idea just was to run the autocorrelation function on the hilbert function and i get a great plot. Didn't use the FFT. What do you think? That would ignore the frequencies completly and just look at the loundness peaks, right?

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@dsp_user yes, thats exactly what I'm after! Can i compute the envelope with the hilbert function? If yes, that would look like this. Then the FFT with a logarithmic y-axis looks like this. You can see the peaks in the hilbert function plot, but I don't see anything in the FFT plot.

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Thanks for your help so far! Oh yeah, my bad. This is the FFT: imgur. I don't show the units because frankly I'm confused what they are. The y-axis is in log10, the peak is at 124. Because of the FFT I have to double it, right? So 248. But it should be 5333 because my signal repeats every 1.33 seconds at 4000Hz. Or does that just mean that the frequency 248Hz is most frequent when the signal repeats?

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@Engineer I get a peak, but I'm confused why: i.imgur.com/UAV8QKQ.png Is the yellow line with z value 0 my periodicity?

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