# Hanning window of MATLAB

by truva
Tags: hanning, matlab, window
 P: 18 Hi all As far as I know Hanning window is defined as the following: .5+.5*cos(2*pi*n/N) and n is between [-(N-1)/2,(N-1)/2] here N is odd number. MATLAB functions "hanning" with symetric or periodic options or "hann" do not match with the results of the above formula. There is always a slight annoying difference ! Do you know the problem? (Same thing for Hamming window)
 PF Gold P: 4,003 I used both in my DSP course without a problem. Maybe this will help: http://www.mathworks.com/help/toolbo.../ref/hann.html
 P: 18 As I understand the book is wrong (Notes On Digital Signal Processing by C. Britton Rorabaugh). If I replace the N by (N-1) in the denumerator of the formulation which is 5+.5*cos(2*pi*n/(N-1)), the results coincide exactly with that of MATLAB. Thank you for the link.

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