initial commit / add all books

1 files changed, 26 insertions, 0 deletions

diff --git a/40/CH7/EX7.4/Exa_7_4.sce b/40/CH7/EX7.4/Exa_7_4.sce
new file mode 100755
index 000000000..a8fa4fd96
--- /dev/null
+++ b/40/CH7/EX7.4/Exa_7_4.sce
@@ -0,0 +1,26 @@
+//sampling of bandpass signals

+fc=4;fl=6;

+B=fl-fc;

+xt=[0 1 2 1];

+xtt=[0 1 2];

+a=0;b=1;c=2;

+xta=[xt];

+xtb=[0 0 2 1 0];

+xtc=[0 0 0 2 1 0];

+xt1=[xta xta xta]; 

+xt2=[xtb xtb(length(xtb):-1:2) xtb(2:length(xtb)) xtb(length(xtb):-1:2)];

+xt3=[xtc(length(xtc):-1:2) xtc(3:length(xtc)) zeros(1:7) xtc(length(xtc):-1:2) xtc(3:length(xtc))];

+f1=0:length(xt1)-1;

+f2=[0 1 1.001 2:6 6.001 7 7.001 8:12 12.001];

+f3=[-10:-8 -7.99 -7:-6 -5.99 -5:6 6.01 7:8 8.01 9:10];

+subplot(211);

+plot2d(f1,xt1);

+xtitle("spectrum of signal sampled at 4KHZ");

+subplot(212);

+plot2d(f2,xt2);

+xtitle("spectrum of signal sampled at 7KHZ");

+xset('window',1);

+b=gca();

+b.y_location="origin"

+plot2d(f3,xt3);

+xtitle("spectrum of signal sampled at 14KHZ");
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