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What tool/filter/mathematic operation would you use to detect the red points marked in this signal?

signal

As you can see there are several differentiated groups and I want to detect those moments in which changes occurs. I cannot use a fixed value for amplitude, because it might change.

I'm using MATLAB if someone wants to use some code for it.

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  • $\begingroup$ Have a look at this question and answers and see if that helps. $\endgroup$ – Peter K. Jul 7 '16 at 16:27
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    $\begingroup$ That would be what I want to do (more or less). The algorithm implementation doesn't work for me right now (some errors that I have to solve) but I'm trying to find some code to try it. $\endgroup$ – tpgalan Jul 11 '16 at 7:48

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