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Taylar window(Kaiser) ,hamming,hanning window?

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Mary Jon
Mary Jon 2013-12-2
评论： Mary Jon 2013-12-2
How difference between these three windows?
If Iam have signal(row vectrors) with length(32) ,How applied this three windows on my signal ?

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Wayne King
Wayne King 2013-12-2
编辑：Wayne King 2013-12-2
Assume x is your signal
x = randn(32,1);
x = x.*hamming(length(x));
The differences in the windows are largely about the width of the main lobe differences in the level of the sidelobes. You can launch wvtool to compare the sidelobe behavior.
wvtool(hamming(32))
Note that some important measurements about the window are displayed at the bottom.
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Mary Jon
Mary Jon 2013-12-2
编辑：Mary Jon 2013-12-2
If I want take PSD to these signals after DFT ,I must take absolute value of DFT by this code? or not necessary,directly applied PSD?
T=(abs(fft(Sig)));
T=T.*conj(T);
T1=(abs(fft(Sig1)));
T1=T1.*conj(T);
T2=(abs(fft(Sig2)));
T2=T2.*conj(T);

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Wayne King
Wayne King 2013-12-2
Yes, after you window the data, you can obtain the DFT of the signals and then take the modulus squared for the magnitude-squared DFT
w111 =hanning(32) ;
Sig = Sig.*repmat(w111,1,8);
SigDFT = abs(fft(Sig).^2);

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