3. Program to generate FM Signal and Analyze the effect of increasing modulation index for each modulation technique.

 

Program to generate FM Signal and Analyze the effect of increasing modulation index for each modulation technique.

// FM --> Frequency Modulation

Ac=10;
Am=10;
wm=2*%pi*25;
wc=2*%pi*400;
t=[1:0.0002:1.1];

m=Am*cos(wm*t);
c=Ac*cos(wc*t);


subplot(5,1,1);
mf=10;
Sam1=Ac*cos(wc.*t+(mf)*sin(wm.*t));
plot(t,Sam1,'red');
legend('m=10');

mf=12;
subplot(5,1,2);
Sam=Ac*cos(wc.*t+mf*sin(wm.*t));
plot(t,Sam ,'blue');
legend('m=12');
xlabel('Time');
ylabel('Amplitude');


subplot(5,1,3);
mf=15;
Sam=Ac*cos(wc.*t+(mf)*sin(wm.*t));
plot(t,Sam,'black');
legend('m=15');


subplot(5,1,4);
mf=20;
Sam=Ac*cos(wc.*t+(mf+20)*sin(wm.*t));
plot(t,Sam,'green');
legend('m=20');

subplot(5,1,5);
mf=15;
Sam1=Ac*cos(wc.*t+(mf)*sin(wm.*t));
plot(t,m,'black',t,c,'green',t,Sam1,'blue');
legend('m=15');

// Output
                                FM --> Frequency Modulation