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Smoothing Filter on Signal

As a suggestion, since you know the shape of the beep is a rectangular pulse, take inspiration from image edge detection by computing the unnormalised cross correlation between your signal and a ...
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Equalizing Standard Deviations of Sequences through Smoothing

One approach is to use the fact that the signal variance (which can be computed from the standard deviation) is equal to the signal power with its mean removed. Therefore: Remove the signal mean ...
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