How is the index of the turning factors W in the FFT butterfly calculated?

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carpantas2016-02-22 18:33:04

Fourier transform

carpantas, 2016-02-22 18:33:04

I can not understand how the index of the turning factor is set in the FFT algorithm.
X(F) = sum(x(t) * W^nk)
W = e^-j*2*pi/N

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