How to demodulate Amplitude Modulation in decay curves?

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Andrej 2014-6-18

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https://ww2.mathworks.cn/matlabcentral/answers/135050-how-to-demodulate-amplitude-modulation-in-decay-curves

Hi I´m dealing with decay curves for my final paper of BSc.

Now I have the problem, that these decay curves have an amplitude modulation. You see a high-frequent-oscillation and something like a superposition with a low-frequent-oscillation.

The problem is, I want only the high-frequent oscillation. I´ve tried to filter the signal with butterworth, but it don´t work. Also I have tried mtalbs function amdemod, but it also doesn´t work. Maybe you have another idea how i can handle the Amplitude Modulation. Sorry for my bad english.

Thanks in advance.