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+clc;
+//page no 5-11
+//Example 5.5
+//The modulating voltage of 2.5V produces frequency deviation of 5kHz
+f=500;//Modulation frequency in Hz
+f2=250;//in Hz
+fd=5;//in kHz
+amp=2.5;//in V
+kf=fd/amp;//frequency deviation constant in kHz/V
+disp(+'kHz/V',kf,'Frequency deviation constant is ');
+//modulating voltage is 7.5V
+amp1=7.5;//in V
+fd1=kf*amp1;//in kHz
+disp(+'kHz',fd1,'Frequency deviation produced when modulating voltage is 7.5V is ');
+//When modulating voltage is 10V
+amp2=10;//in V
+fd2=kf*amp2;
+disp(+'kHz',fd2,'Frequency deviation when modulating voltage is 10V is ');
+//Modulation index be denoted by beta
+beta1=(fd*10^3)/f;
+disp(beta1,'Modulation index 1 is ');
+beta2=(fd1*10^3)/f;
+disp(beta2,'Modulation index 2 is ');
+beta3=(fd2*10^3)/f2;
+disp(beta3,'Modulation index 3 is');