initial commit / add all books

6 files changed, 180 insertions, 0 deletions

diff --git a/2279/CH6/EX6.1/Ex6_1.sce b/2279/CH6/EX6.1/Ex6_1.sce
new file mode 100644
index 000000000..fd38eb38b
--- /dev/null
+++ b/2279/CH6/EX6.1/Ex6_1.sce
@@ -0,0 +1,27 @@
+//Sampling the CT signals

+clc

+clear

+close

+t=-0.3:0.0001:0.3;

+x1=2*cos(2*%pi*20*t);//F1=20Hz

+x2=2*cos(2*%pi*80*t);//F2=80Hz

+figure(1)

+subplot(2,1,1)

+plot(t,x1);

+xtitle("CT Signal X1(t)","t","x1(t)");

+subplot(2,1,2)

+plot(t,x2)

+xtitle("CT Signal X2(t)","t","x2(t)");

+//Given Sampling frequency Fs=60Hz

+Fs=60;

+n=-10:1:10;

+Ts=1/60;//Sampling interval Ts=1/Fs

+x1_n=2*cos(2*%pi*20*n*Ts);

+x2_n=2*cos(2*%pi*80*n*Ts);

+figure(2)

+subplot(2,1,1)

+plot2d3('gnn',n,x1_n,3);

+xtitle("Sampled signal x1[n]","n","x1[n]")

+subplot(2,1,2)

+plot2d3('gnn',n,x2_n,3);

+xtitle("Sampled signal x2[n]","n","x2[n]")

diff --git a/2279/CH6/EX6.2/Ex6_2.sce b/2279/CH6/EX6.2/Ex6_2.sce
new file mode 100644
index 000000000..ac8ea0186
--- /dev/null
+++ b/2279/CH6/EX6.2/Ex6_2.sce
@@ -0,0 +1,19 @@
+//Sampling the CT signals

+clc

+clear

+close

+t=-10:0.01:10;

+x=sin(%pi*t);

+figure(1)

+subplot(2,1,1)

+plot(t,x);

+xtitle("CT Signal sin(pi*t)","t","x(t)");

+Wb=%pi;//Given Sampling frequency is Pi radians

+Ws=2*Wb;

+Fs=Ws/(2*%pi);

+n=-100:1:100;

+Ts=1/Fs;//Sampling interval Ts=1/Fs

+x_n=sin(%pi*n*Ts);

+subplot(2,1,2)

+plot2d(n,x_n,rect=[-100 -2 100 2]);

+xtitle("Sampled signal x[n]","n","x[n]")

diff --git a/2279/CH6/EX6.3/Ex6_3.sce b/2279/CH6/EX6.3/Ex6_3.sce
new file mode 100644
index 000000000..00aaa64e7
--- /dev/null
+++ b/2279/CH6/EX6.3/Ex6_3.sce
@@ -0,0 +1,24 @@
+//Sampling the CT signals

+clc

+clear

+close

+t=-0.3:0.0001:0.3;

+x=5*sin(10*%pi*t);

+figure(1)

+plot(t,x);

+xtitle("CT Signal x(t)","t","x(t)");

+//Given Sampling frequency (a) Fs=15Hz (b) Fs=6Hz

+Fs1=15;

+Fs2=6;

+n=-10:1:10;

+Ts1=1/Fs1;//Sampling interval Ts=1/Fs

+Ts2=1/Fs2;

+x1=5*sin(%pi*10*n*Ts1);

+x2=5*sin(%pi*10*n*Ts2);

+figure(2)

+subplot(2,1,1)

+plot2d3('gnn',n,x1);

+xtitle("Sampled signal Fs=15Hz","n","x1[n]")

+subplot(2,1,2)

+plot2d3('gnn',n,x2);

+xtitle("Sampled signal Fs=6Hz","n","x2[n]")

diff --git a/2279/CH6/EX6.4/Ex6_4.sce b/2279/CH6/EX6.4/Ex6_4.sce
new file mode 100644
index 000000000..b049ab9ef
--- /dev/null
+++ b/2279/CH6/EX6.4/Ex6_4.sce
@@ -0,0 +1,41 @@
+// Continuous Time Fourier Transforms of 

+// Sinusoidal waveforms 3cos(2*pi*t)

+clear;

+clc;

+close;

+// CTFT

+t=-10:0.01:10;

+x=3*cos(2*%pi*t);

+subplot(2,1,1)

+plot(t,x);

+xtitle("CT signal x(t)","t","x(t)");

+T1 = 2;

+T = 4*T1;

+Wo = 6*%pi/T;

+W = [-Wo,0,Wo];

+ak = (2*%pi*Wo*T1/%pi);

+XW =[ak,0,ak];

+subplot(2,1,2)

+plot2d3('gnn',W,real(XW));

+xlabel('                        W');

+xtitle('CTFT of cos(Wot)','W','X(jW)')

+n=-10:10;

+W1=4*%pi;

+W2=8*%pi;

+W3=3*%pi;

+T1=(2*%pi)/W1;

+T2=(2*%pi)/W2;

+T3=(2*%pi)/W3;

+x1=3*cos(2*%pi*n*T1);

+x2=3*cos(2*%pi*n*T2);

+x3=3*cos(2*%pi*n*T3);

+figure(1)

+subplot(3,1,1)

+plot2d3('gnn',n,x1);

+xtitle("X(t) sampled at Ws=4*pi","n","x1[n]");

+subplot(3,1,2)

+plot2d3('gnn',n,x2);

+xtitle("X(t) sampled at Ws=8*pi","n","x2[n]");

+subplot(3,1,3)

+plot2d3('gnn',n,x3);

+xtitle("X(t) sampled at Ws=3*pi","n","x3[n]");

diff --git a/2279/CH6/EX6.6/Ex6_6.sce b/2279/CH6/EX6.6/Ex6_6.sce
new file mode 100644
index 000000000..6b952dc2a
--- /dev/null
+++ b/2279/CH6/EX6.6/Ex6_6.sce
@@ -0,0 +1,16 @@
+//Sampling the signal at nyquist rate

+clear;

+clc;

+close;

+t=-1:0.01:1;

+x=2*cos(200*%pi*t)+3*sin(100*%pi*t)-4*sin(500*%pi*t);

+f1=100;

+f2=50;

+f3=250;

+fb=max(f1,f2,f3);

+Fs=2*fb;

+Ts=1/Fs;

+n=-10:10;

+x_n=2*cos(200*%pi*n*Ts)+3*sin(100*%pi*n*Ts)-4*sin(500*%pi*n*Ts);

+plot2d3('gnn',n,x_n)

+xtitle("DT Signal x(n) sampled at nyquist rate","n","x[n]");

diff --git a/2279/CH6/EX6.7/Ex6_7.sce b/2279/CH6/EX6.7/Ex6_7.sce
new file mode 100644
index 000000000..082423ad3
--- /dev/null
+++ b/2279/CH6/EX6.7/Ex6_7.sce
@@ -0,0 +1,53 @@
+//Determining nyquist rate for the signals

+clc

+clear

+close

+Wb1=4*%pi;

+Wb2=10*%pi;

+Wbs=max(Wb1,Wb2);

+Ws=2*Wbs;

+//Bandlimited frequency doesnt change by Amplitude scaling

+//(a) 2*x1(t)

+Wa=2*Wb1

+disp("Wa=")

+disp(Wa)

+//Timing shifting doesnt affect the magnitude spectrum

+//(b) x1(t-1)

+Wb=2*Wb1

+disp("Wb=")

+disp(Wb)

+//Adding two band-limited spectrums will not sampling frequency

+//(c) 2*x1(t)+x1(t-1)

+Wc=2*Wb1

+disp("Wc=")

+disp(Wc)

+//Compressing time axis expands frequency axis by the same factor

+//(d) x2(2t)

+Wd=2*2*Wb2

+disp("Wd=")

+disp(Wd)

+//Expanding the time axis compresses the frequency axis by same factor

+//(e) x2(t/2)

+We=1/2*2*Wb2

+disp("We=")

+disp(We)

+//(f) x2(2t)+x2(t/2)

+Wf=max(Wd,We)

+disp("Wf=")

+disp(Wf)

+//x1(t)x2(t)

+Wg=2*(Wb1+Wb2)

+disp("Wg=")

+disp(Wg)

+//x1(t)*x2(t)

+Wh=2*min(Wb1,Wb2)

+disp("Wh=")

+disp(Wh)

+//x1(t)*cos(2*%pi*t)

+Wi=2*(Wb1+2*%pi)

+disp("Wi=")

+disp(Wi)

+//x1'(t)

+Wj=2*Wb1

+disp("Wj=")

+disp(Wj)