clear
close all  
clc
% Amplitude Modulation

% c(t)=Ac*cos(2*pi*fc*t);               
% s(t)=Ac*(1+ka*m(t))*cos(2*pi*fc*t);   
% s(t)=Ac*(1+y*cos(2*pi*fm*t))*cos(2*pi*fc*t); % y=Am*ka ;
% s(t)=Ac*(1+Am*ka*cos(2*pi*fm*t))*cos(2*pi*fc*t);

% Ac:Carrier Amplitude, Fc:Carrier Frequenc, M(t):Message Signal;
% Am:Message Signal Amplitute, S(t):Amplitute Modulation;  
% C(t):Carrier Signal, Ka:Amplitude Sensitivity;
% Y:Modulator coefficient, Fm:Message Frequency;

t = linspace(-1,1,1000);
fc = 10;
fm = 1;
Ac = 1;
Am = 1;
ka = 0.5;
c = Ac*cos(2*pi*fc*t); % carrier
m = Am*cos(2*pi*fm*t); % message
mu = Am*ka; % modulation factor
env = Ac*(1 + ka*m); % envelope
s = env .* c; % modulation signal
subplot(311); plot([-1, 1], [0 0], 'k', t, m, 'k', 'LineWidth', 1.5);
axis([-1, 1, -1-0.25, 1+0.25]);
set(gca, 'FontSize', 14, 'Box', 'off', 'LineWidth', 1.5);
xlabel('Time');
ylabel('Magnitude');
title('Message')
subplot(312); plot([-1, 1], [0 0], 'k', t, c, 'k', 'LineWidth', 1.5);
axis([-1, 1, -1-0.25, 1+0.25]);
set(gca, 'FontSize', 14, 'Box', 'off', 'LineWidth', 1.5);
xlabel('Time');
ylabel('Magnitude');
title('Carrier');
subplot(313);
plot([-1, 1], [0, 0], 'k', t, s, 'b', t, env, 'r', 'LineWidth', 1.5);
axis([-1, 1, -1-mu-0.25, 1+mu+0.25]);
set(gca, 'FontSize', 14, 'Box', 'off', 'LineWidth', 1.5);
title(['Amplitude Modulation. mu = ', num2str(mu)], 'Interpreter', 'tex');
xlabel('Time');
ylabel('Magnitude');


<!--'"</title></head>-->

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<div id="tb_container" style="background:#DFDCCF; border-bottom:1px solid #393939; position:relative; z-index:999999999!important">
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