How to find the start and end time of each envelope in a signal? Multiple envelopes in 1 signal

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Chelsea Tanchip
Chelsea Tanchip le 11 Mai 2019
I have a signal and I’m trying to count the number of envelopes + their start and end times (each envelope).
I have the derivative of the signal and tried to use findpeaks but it’s giving me more extrema than I need and I can’t impose a minimum peak distance/height/threshold because I have a wide variety of signals.

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