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+//Example 6.8
+//Program to Plot Magnitude Responce of ideal B.R.F. with 
+//wc1=0.33*pi and wc2=0.67*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))+sin(%pi*(n-U)/3)-sin(%pi*2*(n-U)/3))/(%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 BRF with N=11');
+xgrid (2);
+\ No newline at end of file