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diff --git a/1592/CH6/EX6.1/Example_6_1.sce b/1592/CH6/EX6.1/Example_6_1.sce
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+//Scilab Code for Example 6.1 of Signals and systems by

+//P.Ramakrishna Rao

+//Sampling of signal

+clc;

+clear f n X X_delta w;

+fs=200;

+for f=-200:200

+    X(f+201)=5*[delta(f-75)+delta(f+75)];

+end

+figure(1);

+f=-200:200;

+plot2d3(f,X,-2);

+title('X(f)');

+xlabel('--->  f');

+w=1;

+n=-1;

+    for f=-275:275

+    X_delta1(f+276)=fs*5*[delta(f-n*fs-75)+delta(f-n*fs+75)];

+    end

+n=n+1;

+    for f=-275:275

+    X_delta2(f+276)=fs*5*[delta(f-n*fs-75)+delta(f-n*fs+75)];

+end

+n=n+1;

+    for f=-275:275

+    X_delta3(f+276)=fs*5*[delta(f-n*fs-75)+delta(f-n*fs+75)];

+end

+X_delta=X_delta1+X_delta2+X_delta3;

+figure(2);

+f=-275:275;

+plot2d3(f,X_delta,-2);

+title('X_delta(f) at fs=200');

+xlabel('--->  f');

diff --git a/1592/CH6/EX6.1/Fig6_1_1.jpg b/1592/CH6/EX6.1/Fig6_1_1.jpg
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diff --git a/1592/CH6/EX6.1/Fig6_1_2.jpg b/1592/CH6/EX6.1/Fig6_1_2.jpg
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diff --git a/1592/CH6/EX6.2/Example_6_2.sce b/1592/CH6/EX6.2/Example_6_2.sce
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+//Scilab Code for Example 6.2 of Signals and systems by

+//P.Ramakrishna Rao

+//Sampling of signal and aliasing due to low Sampling frequency

+clc;

+clear f n X X_delta X_delta1 X_delta2 X_delta3 w;

+fs=100;

+for f=-200:200

+    X(f+201)=5*[delta(f-75)+delta(f+75)];

+end

+figure(1);

+f=-200:200;

+plot2d3(f,X,-2);

+title('X(f)');

+xlabel('--->  f');

+w=1;

+n=-2;

+    for f=-175:175

+    X_delta1(f+176)=fs*5*[delta(f-n*fs-75)+delta(f-n*fs+75)];

+    end

+n=n+1;

+    for f=-175:175

+    X_delta2(f+176)=fs*5*[delta(f-n*fs-75)+delta(f-n*fs+75)];

+end

+n=n+1;

+    for f=-175:175

+    X_delta3(f+176)=fs*5*[delta(f-n*fs-75)+delta(f-n*fs+75)];

+end

+n=n+1;

+    for f=-175:175

+    X_delta4(f+176)=fs*5*[delta(f-n*fs-75)+delta(f-n*fs+75)];

+end

+n=n+1;

+    for f=-175:175

+    X_delta5(f+176)=fs*5*[delta(f-n*fs-75)+delta(f-n*fs+75)];

+end

+X_delta=X_delta1+X_delta2+X_delta3+X_delta4+X_delta5;

+figure(2);

+f=-175:175;

+

+plot2d3(f,X_delta,-2);

+title('X_delta(f) at fs=100');

+xlabel('--->  f');

+//The Presence of the 25 HZ component in the spectrum of x_delta(t)

+//Due to effect of Aliasing

diff --git a/1592/CH6/EX6.2/Fig6_2_1.jpg b/1592/CH6/EX6.2/Fig6_2_1.jpg
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diff --git a/1592/CH6/EX6.2/Fig6_2_2.jpg b/1592/CH6/EX6.2/Fig6_2_2.jpg
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diff --git a/1592/CH6/EX6.3/Example_6_3.sce b/1592/CH6/EX6.3/Example_6_3.sce
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+//Scilab Code for Example 6.3 of Signals and systems by

+//P.Ramakrishna Rao

+//Minimum no. of samples required

+clc;

+clear;

+syms t;

+x=10*cos(6*%pi*t)+4*sin(8*%pi*t);

+disp(x,'x(t)');

+disp('Maximum Frequency component present: 4 Hz');

+fs=2*4;

+disp(fs,'Minimum Sampling Frequency to avoid distortion is:');

diff --git a/1592/CH6/EX6.4/Example_6_4.sce b/1592/CH6/EX6.4/Example_6_4.sce
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+//Scilab Code for Example 6.4 of Signals and systems by

+//P.Ramakrishna Rao

+//Sampling Frequency

+clc;

+clear;

+//x(t)=100*(sinc(100*t))^2;

+fo=100;

+fs=2*fo;

+disp(fs,'Minimum Sampling Frequency to avoid distortion is:');

diff --git a/1592/CH6/EX6.5/Example_6_5.sce b/1592/CH6/EX6.5/Example_6_5.sce
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+//Scilab Code for Example 6.5 of Signals and systems by

+//P.Ramakrishna Rao//Output of LPF

+clc;

+clear;

+

+for f=-100:100

+    X(f+101)=delta(f+100)+delta(f-100)+3*[delta(f+90)+delta(f-90)];

+end

+f=-100:100;

+a=gca();

+a.x_location="origin";

+a.y_location="origin";

+plot2d3(f,X,-2);

+title('Spectrum of x(t)');

+xlabel('-->  f');

+fs=150;

+n=-1;f-n*fs

+    for f=-275:275

+    X_delta1(f+276)=delta(f-n*fs+100)+delta(f-n*fs-100)+3*[delta(f-n*fs+90)+delta(f-n*fs-90)];

+    end

+n=n+1;

+    for f=-275:275

+    X_delta2(f+276)=delta(f-n*fs+100)+delta(f-n*fs-100)+3*[delta(f-n*fs+90)+delta(f-n*fs-90)];

+end

+n=n+1;

+    for f=-275:275

+    X_delta3(f+276)=delta(f-n*fs+100)+delta(f-n*fs-100)+3*[delta(f-n*fs+90)+delta(f-n*fs-90)];

+end

+X_delta=X_delta1+X_delta2+X_delta3;

+figure(2);

+f=-275:275;

+plot2d3(f,X_delta,-2);

+title('X_delta(f) at fs=150');

+xlabel('--->  f');

diff --git a/1592/CH6/EX6.5/Fig6_5_1.jpg b/1592/CH6/EX6.5/Fig6_5_1.jpg
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diff --git a/1592/CH6/EX6.5/Fig6_5_2.jpg b/1592/CH6/EX6.5/Fig6_5_2.jpg
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+++ b/1592/CH6/EX6.5/Fig6_5_2.jpg
diff --git a/1592/CH6/EX6.6/Example_6_6.sce b/1592/CH6/EX6.6/Example_6_6.sce
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+++ b/1592/CH6/EX6.6/Example_6_6.sce
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+//Scilab Code for Example 6.6 of Signals and systems by

+//P.Ramakrishna Rao

+//Sampling Frequency / Nyquist Rate

+clc;

+clear;

+syms t;

+x=12*cos(800*%pi*t)*cos((1800*%pi*t))^2;

+disp(x,'x(t)');

+disp('Maximum Frequency component present: 2200 Hz');

+fs=2*2200;

+disp(fs,'Minimum Sampling Frequency to avoid distortion is(Hz):');

diff --git a/1592/CH6/EX6.8/Example_6_8.sce b/1592/CH6/EX6.8/Example_6_8.sce
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+//Scilab Code for Example 6.8 of Signals and systems by

+//P.Ramakrishna Rao

+//Sampling Frequency of BPS

+clc;

+clear;

+disp('Maximum Frequency component present: 25 kHz');

+fs=2*25000;

+disp(fs,'Minimum Sampling Frequency to avoid distortion is:(Hz)');