# How to detect oscillations/characteristic frequencies in data?

**URL:** <https://discourse.julialang.org/t/how-to-detect-oscillations-characteristic-frequencies-in-data/105169>\
**Category:** Signal and Image Processing\
**Tags:** dsp, fft\
**Created:** [October 19, 2023, 9:47am UTC](https://discourse.julialang.org/t/how-to-detect-oscillations-characteristic-frequencies-in-data/105169 "2023-10-19T09:47:32Z")\
**Posts on this page:** 1\
**Showing post:** 3

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**Author:** ![rafael.guerra](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/rafael.guerra/32/216610_2.png) [@rafael.guerra](https://discourse.julialang.org/u/rafael.guerra)\
**Post date:** [October 19, 2023, 10:03am UTC](https://discourse.julialang.org/t/how-to-detect-oscillations-characteristic-frequencies-in-data/105169/3 "2023-10-19T10:03:47Z")

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> [@Torkel](#):
>
> Removing the mean have little effect:

You should subtract, not divide!

PS:  
Check out the [EasyFFTs package](https://discourse.julialang.org/t/ann-announcing-easyffts-jl/90174).

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