initial commit / add all books

2 files changed, 28 insertions, 0 deletions

diff --git a/40/CH7/EX7.12/Exa_7_12.jpg b/40/CH7/EX7.12/Exa_7_12.jpg
new file mode 100755
index 000000000..5bc821696
--- /dev/null
+++ b/40/CH7/EX7.12/Exa_7_12.jpg
diff --git a/40/CH7/EX7.12/Exa_7_12.sce b/40/CH7/EX7.12/Exa_7_12.sce
new file mode 100755
index 000000000..5a246a91c
--- /dev/null
+++ b/40/CH7/EX7.12/Exa_7_12.sce
@@ -0,0 +1,28 @@
+//Anti Imaging Filter considerations

+Ap=0.5;//passband attenuation

+fp=20;//passband edge frequency

+As=60;//stopband attenuation

+S=42.1;

+fs=S-fp;//stopband edge frequency

+e=sqrt(10^(0.1*Ap)-1);

+e1=sqrt(10^(0.1*As)-1);

+n=(log10(e1/e))/(log10(fs/fp));

+n=ceil(n)//design of nth order butworth filter

+//(b)Assuming Zero-order hold sampling

+S1=176.4;

+fs1=S1-fp;

+Ap=0.316;

+e2=sqrt(10^(0.1*Ap)-1);

+n1=(log10(e1/e2))/(log(fs1/fp));//new order of butworth filter

+n1=ceil(n1)

+f=0:100;

+x=abs(sinc(f*%pi/S));

+f1=0:500;

+x1=abs(sinc(f1*%pi/S1));

+a=gca();

+subplot(211);

+plot2d(f,x);

+xtitle("spectra under normal sampling condition","f(kHZ)","sinc(f/s1)");

+subplot(212);

+plot2d(f1,x1);

+xtitle("spectra under over sampling condition","f(kHZ)","sinc(f/s1)");
\ No newline at end of file