initial commit / add all books

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+//Design of interpolating filters

+//(a)Design using a single stage interpolator

+fp=1.8;Sout=48;Sin=4;

+Ap=0.6;As=50;

+fs=Sin-fp;

+//finding ripple parameters

+delp=(10^(Ap/20)-1)/(10^(Ap/20)+1);

+dels=10^(-As/20);

+N=Sout*(-10*log10(delp*dels)-13)/(14.6*(fs-fp))+1;

+disp('By using single stage interpolator the filter design is:');

+ceil(N)

+//Design using 3-stage interpolator with I1=2;I2=3;I3=2

+Ap=0.2;

+Sin=[4 8 24];

+Sout=[8 24 48];

+fp=[1.8 1.8 1.8];

+fs=Sin-fp;

+delp=(10^(Ap/20)-1)/(10^(Ap/20)+1);

+dels=10^(-As/20);

+p=14.6*(fs-fp);

+N1=((-10*log10(delp*dels)-13)./p);

+N1=(Sout.*N1)+1;N=0;

+for i=1:length(N1)

+    N=N+N1(i);

+end

+disp('By using single stage interpolator the filter design is:');

+ceil(N)
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