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diff --git a/40/CH10/EX10.6b/Exa_10_6b.jpg b/40/CH10/EX10.6b/Exa_10_6b.jpg
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diff --git a/40/CH10/EX10.6b/Exa_10_6b.sce b/40/CH10/EX10.6b/Exa_10_6b.sce
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+//optimal Fir band pass filter design
+fp=8;fs=16;
+Ap=1;As=50;S=48;
+Fp=fp/S;Fs=fs/S;
+FT=0.1;FC=0.25
+//calculation of filter length
+delp=(10^(Ap/20)-1)/(10^(Ap/20)+1);
+dels=10^(-As/20);
+del=min(delp,dels);
+N=1+((-10*log10(del*del)-13)/(14.6*FT));
+N1=19;
+[hn]=eqfir(N1,[0 1/6;1/3 0.5],[1 0],[1 1]);
+[HF,fr]=frmag(hn,200);
+Hf=20*log10(HF);
+a=gca();
+plot(fr,Hf);
+xlabel('Digital frequency F');
+ylabel('Magnitude in dB');
+xtitle('optimal Half band LPF N=17');
+\ No newline at end of file