MATLAB: How to control the computer’s audio volume from the MATLAB command prompt

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I want to adjust the audio volume of my computer using MATLAB.

Best Answer

The ability to directly control your computer's audio volume is not available in MATLAB.

To work around this issue you can use the SYSTEM function in MATLAB to issue commands to another program that can control audio volume. Users on Windows systems can also use the DOS function.

For more information on the SYSTEM or DOS functions, type:

doc system
doc dos

at the MATLAB command prompt.

Related Solutions

MATLAB: How to control the audio volume when using AUDIOPLAYER in MATLAB

A function to control audio volume directly is not available as of MATLAB R2015a.

As a workaround, you can modify the value of the signal data to control volume. Please see the code below for an example:

load handel; % 'handel' is a MAT-file which is shipped with MATLAB as an example
x = y/5; % Decrease volume
player = audioplayer(x, Fs);
play(player,[1 (get(player, 'SampleRate')*3)]);
x = y*5; % Increase volume
player = audioplayer(x, Fs); 
play(player,[1 (get(player, 'SampleRate')*3)]);

As an additional workaround, you might try using the File Exchange submission called "SoundVolume", which sets or gets the computer system's speaker sound volume using Java. This submission can be found at the following link:

http://www.mathworks.com/matlabcentral/fileexchange/25584-soundvolume-set-or-get-the-system-speaker-sound-volume

MATLAB: Does MATLAB 6.5 (R13) crash or stop playing sounds when I use the SOUND function in a FOR loop

The Windows operating system contains a bug that causes a crash when multiplexing several audio streams through one output device. The SOUND function is asynchronous, meaning that after the SOUND function is called, it immediately returns control back to the command line or to the file from where it was called. When the SOUND function is used in a loop, it almost always has the problem specified above.

To work around this problem, you can use the AUDIOPLAYER function in a loop. The 'Playblocking' method of the AUDIOPLAYER function does not return control until playback has completed. The following code is an example of the syntax to use with the AUDIOPLAYER function:

load handel  
ap = audioplayer(y,Fs);
playblocking(ap);

You can also use the WAVPLAY function with the additional input argument 'sync' to force the sound device to finish playing the sound and then return control back to MATLAB. The following is an example of the syntax to use for the WAVPLAY function:

load chirp;
y1 = y; Fs1 = Fs;
load gong;
wavplay(y1,Fs1,'sync') % The chirp signal finishes before the 
wavplay(y,Fs)          % gong signal begins playing.

More information about the WAVPLAY and AUDIOPLAYER functions can be found in the help documentation. You can access the help documentation by using the HELP or DOC commands with the following syntax:

help wavplay
doc waveplay
help audioplayer
doc audioplayer

Best Answer

Related Solutions

MATLAB: How to control the audio volume when using AUDIOPLAYER in MATLAB

MATLAB: Does MATLAB 6.5 (R13) crash or stop playing sounds when I use the SOUND function in a FOR loop

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