Amplitude Modulation Synthesis function in matlab?

For Amplitude Modulation, it suppose to have carrier amplitude and modulated amplitude.

however, the matlab built in function which is ammod, i cannot find which is carrier amplitude.

https://uk.mathworks.com/help/comm/ref/ammod.html

y = ammod(x,Fc,Fs,ini_phase)

Thanks!

Answer 1

[AR]

Hi @Matlaber,

As per my understanding, for “y = ammod(x, Fc, Fs, ini_phase)”, the carrier amplitude is implicitly set to 1. The same can be seen in the example below:

% Parameters
Fs = 1000;           % Sampling frequency
Fc = 100;            % Carrier frequency
ini_phase = 0;       % Initial phase
t = (0:1/Fs:1)';     % Time vector
 % Message signal (constant)
x = ones(size(t));
 % Modulate the signal
y = ammod(x, Fc, Fs, ini_phase);
 % Plot the modulated signal
figure;
plot(t, y);
title('AM Modulated Signal');
xlabel('Time (s)');
ylabel('Amplitude');
grid on;

 % Calculate the peak amplitude
peak_amplitude = max(abs(y));
disp(['Peak amplitude of the modulated signal: ', num2str(peak_amplitude)]);

Peak amplitude of the modulated signal: 1

If the need is to explicitly control the carrier amplitude, use the extended syntax that includes the carrier amplitude parameter -

y = ammod(x, Fc, Fs, ini_phase, carramp)

Refer the below link for the same:

https://www.mathworks.com/help/comm/ref/ammod.html#d126e4412

Hope this helps!