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I have been using excel to calculate the power spectrums for both HANN and RECTANGULAR windowing with :
N - 1
DFT = X(K) =1/N ∑ x(n) ( cos (2πnk/N) - j sin (2πnk/N) )
n = 0
HANN x(n) = 0.5 (1 - cos (2πn/(N-1)))...
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