Check for incorrect argument data type or missing argument in call to function 'sin'.

I'm simulating modulation of my audio signal into a carrier wave.

clc
clear all;
close all;

%Audio
ADS = audioDatastore("AUDIO.wav");
info = audioinfo('AUDIO.wav');
[y,Fs] = audioread('AUDIO.wav');
sound(y,Fs)
t = 0:seconds(1/Fs):seconds(info.Duration);
t = t(1:end-1);

%Carrier Wave
Fc = 400000;
Ca = 100;
Cs = Ca*sin(2*pi*Fc*t);

%Amplitude Modulation
x = modulate(y,Cs,Fs);

%Plot
subplot(3,1,1);
plot(t,y)
xlabel('Time')
ylabel('Audio Signal')

subplot(3,1,2);
plot([y,Fs]);
title('Carrier');
ylabel('Amplitude');

subplot(3,1,3);
plot(x);
title('Modulated Amplitude');
ylabel('Amplitude');

[Torsten]

After the line

t = t(1:end-1);

include the lines

size(t)
class(t)

What information does MATLAB print ?

[Torsten]

The class of t is "duration". This is not accepted by the sin-function.

Use

t = 0:seconds(1/Fs):seconds(info.Duration);
t = t(1:end-1);
t = seconds(t);

instead of

t = 0:seconds(1/Fs):seconds(info.Duration);
t = t(1:end-1);

[Kervin Aranzado]

I still get the same message " Check for incorrect argument data type or missing argument in call to function 'sin'. "

clc
clear all;
close all;


%Audio
ADS = audioDatastore("AUDIO.wav");
info = audioinfo('AUDIO.wav');
[y,Fs] = audioread('AUDIO.wav');
sound(y,Fs)
t = 0:seconds(1/Fs):seconds(info.Duration);
t = t(1:end-1);
size(t)
class(t)


%Carrier Wave
Fc = 400000;
Ca = 100;
Cs = Ca*sin(2*pi*Fc*t);

%Amplitude Modulation
x = modulate(y,Cs,Fs);

%Plot
subplot(3,1,1);
plot(t,y)
xlabel('Time')
ylabel('Audio Signal')

subplot(3,1,2);
plot([y,Fs]);
title('Carrier');
ylabel('Amplitude');

subplot(3,1,3);
plot(x);
title('Modulated Amplitude');
ylabel('Amplitude');

[Torsten]

See my answer above.

[Kervin Aranzado]

The result

clc;
clear all;
close all;


%Audio
ADS = audioDatastore("AUDIO.wav");
info = audioinfo('AUDIO.wav');
[y,Fs] = audioread('AUDIO.wav');
sound(y,Fs);
t = 0:seconds(1/Fs):seconds(info.Duration);
t = t(1:end-1);
t = seconds(t);
size(t)
class(t)

%Carrier Wave
Fc = 400000;
Ca = 100;
Cs = Ca*sin(2*pi*Fc*t);

%Amplitude Modulation
x = modulate(y,Cs,Fs);


%Plot
subplot(3,1,1);
plot(t,y);
xlabel('Time')
ylabel('Audio Signal')

subplot(3,1,2);
plot([y,Fs]);
title('Carrier')
ylabel('Amplitude')

subplot(3,1,3);
plot(x);
title('Modulated Amplitude')
ylabel('Amplitude')

[Torsten]

The command

plot([y,Fs])

does not make sense.

Read again what the outputs from "audioread" mean.

y is a vector, Fs is a scalar value.

[Kervin Aranzado]

Code Check:

clc;
clear all;
close all;


%Audio
ADS = audioDatastore("AUDIO.wav");
info = audioinfo('AUDIO.wav');
[y,Fs] = audioread('AUDIO.wav');
sound(y,Fs);
t = 0:seconds(1/Fs):seconds(info.Duration);
t = t(1:end-1);
t = seconds(t);
size(t)
class(t)

%Carrier Wave
Fc = 22000;
Ca = 100;
Cs = Ca*sin(2*pi*Fc*t);

%Amplitude Modulation
x = modulate(y,Cs,Fs);


%Plot
subplot(3,1,1);
plot(t,y);
xlabel('Time')
ylabel('Audio Signal')

subplot(3,1,2);
plot(y,Fs);
title('Signal')
ylabel('Amplitude')

subplot(3,1,3);
plot(x);
title('Modulated Amplitude')
ylabel('Amplitude')

[Kervin Aranzado]

Is there a problem with the signal plotting or it's just it?

[Walter Roberson]

Fs is your sampling frequency for the audio. It does not change over time. And you are using your -1 to +1 audio signal as your independent variable for the plot.