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+//Example 5.9
+//To Design a Chebyshev Filter with Given Specifications
+clear;
+clc ;
+close ;
+ap=2.5;//db
+as=30;//db
+op=20;//rad/sec
+os=50;//rad/sec
+N=acosh(sqrt((10^(0.1*as)-1)/(10^(0.1*ap)-1)))/acosh(os/op);
+disp(ceil(N),'Order of the filter, N =');
+\ No newline at end of file