Use this script to plot the Amplitude Modulated Spectrum.
% Define the Baseband signal
t = linspace(0, 1, 1000);
Am=5;
fm=3000;
x = Am*cos(2*pi*fm*t);
% Define the carrier signal
fc = 5000000;
Ac = 10;% modulation index is the ratio of amplitudes of message and carrier signals
c = Ac*cos(2*pi*fc*t);
% Modulate the carrier with the baseband signal
m = 0.5;
s = Ac*cos(2*pi*fc*t).*(1+0.5*cos(2*pi*fm*t));
% Plot the time-domain waveform
subplot(3,1,3);
plot(t, s);
xlabel('Time (s)');
ylabel('Amplitude');
title('Spectrum of AM Signal');
