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I have two signals one continous oscillating at a high frequency and another one instantaneous at a lower frequency.

How can I use a fourier transform to single out the low frequency one?

See at attached picture for what I am trying to do.

Edit:

Yeah by the way, data is collected in a two dimensional arrays (so discrete)

How can I use a fourier transform to single out the low frequency one?

See at attached picture for what I am trying to do.

Edit:

Yeah by the way, data is collected in a two dimensional arrays (so discrete)

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