sound will not play Mac Matlab 2018b

Hi there, I am working through a brilliant Udeny course in Matlab and am currently working on generating a sound but am finding that this session does not work, even though I have written exactly as specified (I think!)

frequencies = 5000; % Hz
duration = 1; % duration of the sound
amplitude = 1; % loudness
fs = 44100; % Sampling rate
T = 1 / fs ; % Time sampling period
t = 0:T:duration; % time vector
 
signal = amplitude * cos(2 * pi * frequencies * t);
sound(signal, fs)

Can anyone tell me where I'm going wrong please?

[Walter Roberson]

It works for me on my Mac; it also works for me if I run it on MATLAB online.

I could make the general advice about making sure that your speaker is not muted, and that the volume is sufficient.

As an experiment, try

load handel
sound(y, Fs)

[Ajay Pattassery]

As suggetsed above, try the following code.

load chirp.mat
sound(y, Fs)

If you are still not hearing the sound, then it is nothing to do with the code you wrote.

Anyways, I do not see any problem in your code.

Make sure there are no environmental issues outside MATLAB by playing any audio file on your pc.

Please respond if you are still facing the issue.

[Tracey Rochester]

Em... how do I use Matlab online?? I presume I need to be online to load the files you each refer to? Thank you!

[Tracey Rochester]

Hi there, still facing the issue. I get this error message:

[Walter Roberson]

Ah, it would have helped to have that earlier. You need to rename or delete that file as it is interfering with playing sound.

[Tracey Rochester]

Sorry, you're quite right, I should have included that vital piece of information. I have deleted the file called "sound.m", but now get this error message:

[Walter Roberson]

I suspect that you still have another sound.m

which -all sound

[Walter Roberson]

MATLAB Online is at

http://matlab.mathworks.com

Not all licenses have access to that, but current student licences do.

[Tracey Rochester]

Thank you everyone, I trashed my file, and then emptied it, and the sound is now playing.

Answer 1

[Ajay Pattassery]

The issue is most likey due to having multiple user-defined sound.m files.

Replace sound(signal, fs) with the following code

player = audioplayer(signal,fs);
play(player)

If it is playing for the above code, execute the following line

which -all sound

If it returns more than one sound.m location, rename all the sound.m files in location other than MATLAB builtin path which ends with toolbox\matlab\audiovideo\sound.m

Answer 2

[Tracey Rochester]

By the way, I'm running MATLAB R2018b, on a Mac, OS 10.14.6 Mojave...