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Question: No matter of scale, How to use Fourier transform to extract the part of data which higher than near flat data?

Question:No matter of scale, How to use Fourier transform to extract the part of data which higher than near flat data?

ComputerUser 535 Maple 12
discrete-fourier-transform signal-processing duplicate-question
November 19 2019
0

How to use Fourier transform to extract the part of data which higher than near flat data no matter of scale such as very small decimal value?

would like to extract part when very small decimal small start to increasing or a noise start to appear in time series data.

and then highlight with rectangle in plot for that part of data.

if Fourier transform can not detect this noise or an increasing data or spike then return 0, if detected then return 1
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