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+//Scilab Code for Example 9.11 of Signals and systems by

+//P.Ramakrishna Rao

+//Power Spectral Density 

+clear;

+clc;

+clear f n;

+fo=2;

+n=1;

+RC=1/(2*%pi*10^3);

+w=4*%pi*10^3

+H=1/(1+%i*w*RC);

+disp(H,'H(f)');

+X=(abs(H))^2;

+for f=-5:5

+    Pxx(n)=25*[delta(f-fo)+delta(f+fo)];

+    Pyy(n)=X*Pxx(n);

+    n=n+1;

+end

+disp(Pxx,'Pxx=');

+disp(Pyy,'Pyy=');

+f=-5:5;

+plot2d3(f,Pyy,-2);

+title('Power Spectral Density');

+ylabel('Pyy(f)');

+xlabel('f in Hz');