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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)
+\ No newline at end of file