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+//Example 5.2
+//To Find out the order of a Low Pass Butterworth Filter
+clear;
+clc ;
+close ;
+ap=3;//db
+as=40;//db
+fp=500;//Hz
+fs=1000;//Hz
+op=2*%pi*fp;
+os=2*%pi*fs;
+N=log(sqrt((10^(0.1*as)-1)/(10^(0.1*ap)-1)))/log(os/op);
+disp(ceil(N),'Order of the filter, N =');
+\ No newline at end of file