according to the message signal. AM is widely used in electronic communication field. The plotting of AM signal using MATLAB
is very easy.
%%%%%%%%%%% Amplitude Modulation %%%%%%%
clc;
clear all;
close all;
t=0:0.001:1;
set(0,'defaultlinelinewidth',2);
A=input('Enter the amplitude of message signal - : ');
fm=input('Enter the Message frequency - : ');% Message signal frequecny
fc=input('Enter the Carrier frequency - : ');% Carrier signal frequency
mi=input('Modulation Index - : ');
if (mi >1 || mi < 0 )
disp('Enter value between 0 and 1');
break;
end
x=A*sin(2*pi*fm*t);%Message Signal
subplot(3,1,1);%Plotting frame divided in to 3 rows and this fig appear at 1st
plot(t,x);
xlabel('Time');
ylabel('Amplitude');
title('Message Signal');
grid on;
c=A*sin(2*pi*fc*t);%Carrier Signal
subplot(3,1,2);
plot(t,c);
xlabel('Time');
ylabel('Amplitude');
title('Carrier Signal');
grid on;
am=(A+mi*x).*sin(2*pi*fc*t);%AM Signal, Amplitude of Carrier changes to (A+Message)
subplot(3,1,3);
plot(t,am);
xlabel('Time');
ylabel('Amplitude');
title('AM Signal');
grid on;
%%%%%%%%%%%% END %%%%%%%%%%%55
Enter the amplitude of message signal - : 2
Enter the Message frequency - : 5
Enter the Carrier frequency - : 100
Modulation Index - : 0.5
Contact:
Mr. Roshan P. Helonde
Mobile: +91-7276355704
WhatsApp: +91-7276355704
Email: roshanphelonde@rediffmail.com
