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+//Example 4.27
+//Interconnectiuion of LTI systems
+n2=0:18;
+h1=[1 5 10 11 8 4 1];
+h2=[1 1 zeros(1,5)];
+h3=[1 1 zeros(1,5)];
+a=convol(h1,h2);
+h=convol(a,h3);
+x=[1 -1];
+n1=[0 1];
+n3=0:19;
+y=convol(x,h);
+subplot(3,1,1)
+xtitle("input signal x(n)","....................n","x[n]");
+plot(n1,x,'.');
+subplot(3,1,2)
+xtitle("system response h(n)","....................n","h[n]");
+plot(n2,h,'.');
+subplot(3,1,3)
+xtitle("output signal y(n)",".............................n","y[n]");
+plot(n3,y,'.');