sound() function playback ends after a few seconds

I am using the 2011a student edition on a new MacBook Pro.

When I use the sound() function, the sound playback stops at 10 seconds, regardless of the input vector size.

For example, the following simple script should play a sound for about 20 seconds, but it stops after 10 seconds on my Mac. Any help would be appreciated.

clc; clear all;

a = linspace(0, 1, 200000);
d = linspace(1, 0.5, 200000);
s = linspace(0.5, 0.1, 200000);
r = linspace(0.1, 0, 200000);

adsr = [a d s r];
plot(adsr);

f = 500;
fs = 44100;
n = 0:length(adsr)-1;
x = sin(2 * pi * f * n / fs);
y = x.*adsr;
plot(y);
sound(3 * y, fs);

Answer 1

[Daniel Shub]

This is a known bug with a fix provided by TMW

http://www.mathworks.co.uk/support/bugreports/736680

[MatlabUser]

THANK YOU!

Evidently there's a bug in 2011a for Mac and Linux. The fix on that webpage did the trick.

Answer 2

[bym]

try:

x = sin(2 * pi * f * n ./ fs); % note./

[Walter Roberson]

That isn't going to help. fs is a scalar constant, and mrdivide ( / ) by a scalar constant is the same as rdivide ( ./ ) by the same constant.

[bym]

doh! must be a platform issue then, the above script seems to work on my computer (windows XP Matlab 2008b)

[David Young]

It sounds for 20s for me also. Windows 7 64-bit, Matlab 2011a.