initial commit / add all books

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diff --git a/40/CH7/EX7.6/Exa_7_6.sce b/40/CH7/EX7.6/Exa_7_6.sce
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+//signal reconstruction from samples

+//(a)By step interpolation method

+x=[-1 2 3 2];

+t=2.5;

+ts=1;

+t1=ceil(t);

+t2=floor(t);

+x1t=x(t2)

+//(b)By linear interpolation method

+x2t=(x(t1)+x(t2))/2

+//(c)By sinc interpolation method

+x3t=0;x1=[1 2 3 4];

+for k=1:4

+    x3t=x3t+(x1(k)*sinc(%pi*(t-(k-1))));

+end

+x3t//sinc interpolated value of x(2.5)

+//(d)raised cosine interpolation method

+x4t=0;

+for k=1:4

+    p=(cos(0.5*%pi*(t-k+1))/(1-(t-k+1)^2));

+    xt=x1(k)*sinc(%pi*(t-k+1))*p;

+    x4t=x4t+xt;

+end

+x4t//raised cosine interpolated value of x(2.5)
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