Taylar window(Kaiser) ,hamming,hanning window?

How difference between these three windows?

If Iam have signal(row vectrors) with length(32) ,How applied this three windows on my signal ?

Answer 1

[Wayne King]

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.

[Mary Jon]

 Thank you Wayne.

this code is true or not of 8 signals with length(32)

on each signal applied this three windows

 w111 =hanning(32) ;
w222= hamming(32); 
w333 =kaiser(32,2.5); 
wvtool(w111,w222,w333)

 Sig = Sig.*repmat(w111,1,8);
Sig1 = Sig1.*repmat(w222,1,8);
Sig2 = Sig2.*repmat(w333,1,8);

[Wayne King]

Yes, absolutely correct.

[Mary Jon]

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);

Answer 2

[Wayne King]

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);

[Mary Jon]

Thank you, Really thank you Mr. Wayne king