User
%AM Modulation;
clear;
clc;
clf;
Ac=5;
Am=5;
fc=9000;
fm=600;
t=0:0.00001:0.003;
m=Am*cos(2*pi*fm*t);
c=Ac*cos(2*pi*fc*t);
mi = Am/Ac;
s=Ac*(1+mi*cos(2*pi*fm*t)).*cos(2*pi*fc*t);
subplot(2,2,1);
plot(t,s);
xlabel('time');
ylabel('amplitude');
title('AM modulation');
subplot(2,2,4);
plot(t,m);
xlabel('time');
ylabel('amplitude');
title('Message');
subplot(2,2,2);
plot (t,c);
xlabel('time');
ylabel('amplitude');
title('Carrier');
subplot(2,2,3);
yyaxis left;
plot(t,m);
ylim([-10 10])
yyaxis right;
9
plot(t,s);
ylim([-10 10])
title('combined message and signal');
select the correct statement regarding your observation.
a. The signal, s(t), faithfully represents the original message wave m(t)
b. The receiver will be unable to demodulate the modulated carrier wave shown in the upper left plot
c. The AM modulated carrier shows significant signal distortion
d. a and b