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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);
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