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utopcell
on Nov 27, 2022
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I over-engineered a Fast Fourier Transform for Ard...
If X_k is the coefficient for the sample window (x_0, x_1, .., x_{n-1}) and X'_k is the coefficient for window (x_1, .., x_n) then X'_k = (X_k + x_n - x_0)exp(2pik/n).
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