initial commit / add all books

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diff --git a/692/CH5/EX5.11/P5_11.sce b/692/CH5/EX5.11/P5_11.sce
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+//EXAMPLE 5.11
+//Circular convolution using DFT
+clc;
+clear;
+g = [1 2 0 1];
+disp(g,'g[n] = ');
+h = [2 2 1 1];
+disp(h,'h[n] = ');
+M=4;
+for n=0:M-1
+        for k=0:M-1
+            W(n+1,k+1) = exp(-(%i*2*%pi*k/M)*n);
+        end
+    end
+    G = W*g';
+    H = W*h';
+disp(G,'DFT is, G = ');
+disp(H,'DFT is, H = ');
+
+Y=G.*H;
+y=(1/4)*conj(W)*(Y);
+disp(real(y),'Circular convolution = ');
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