Spectrum Decreasing Detection

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cyberdyne on 15 Sep 2011
Closed: MATLAB Answer Bot on 20 Aug 2021
How can I build a model in simulink that detects decreasing of spectral components ?
For example, if I have a signal with a spectrum between 0 and 100Hz and at particular instant of time it turns between 0 and 50Hz gradually, how can I detect when it decreases to 10% of initial spectrum ?
I hope I'm clear in the explanation.

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