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+//Example 6.5
+//Program to Plot Magnitude Responce of ideal L.P.F. with wc=0.5*pi
+//N=11
+clear;
+clc ;
+close ;
+N=11;
+U=6;
+for n=-5+U:1:5+U
+if n==6 
+hd(n)=0.5;      
+else
+hd(n)=(sin(%pi*(n-U)/2))/(%pi*(n-U));
+end
+end
+[hzm ,fr ]= frmag (hd ,256) ;
+hzm_dB = 20* log10 (hzm)./ max ( hzm );
+figure;
+plot (2*fr , hzm_dB );
+a= gca ();
+xlabel ('Frequency w*pi');
+ylabel ('Magnitude in dB');
+title ('Frequency Response of FIR LPF with N=11');
+xgrid (2);
+\ No newline at end of file