MATLAB: Do I hear nothing? sound function

MATLABsound

I finally wanna hear what a linear function sounds like. Why does: 
dt = 0.001;
t = 0:dt:2;
x = 1.*t;
plot(t,x)
sound(x,1/dt)
not work? Too low frequency? Or is it a property of the function, because there are no oscillations in it?

Best Answer

According to the documentation, the sound data (first input to sound()) is an mx1 or mx2 matrix. Your sound data are 1x2001. Sound data typically contains values between [-1,1]. The range of your sound data is [0,2].
Valid sampling rates (second input to sound()), are 1000-384000Hz, accepted by Matlab, but also depend on your hardware. In reality, 1000Hz is very low for standard hardware. My Realtek audio supports a 44.1k/48k/96k/192kHz sample rate. To see info on your audio card in Windows, run dxdiag (win + r), and look at the Sound tab.
If you run your audio without specifying the sampling rate or specifying a much higher rate such as 44100, you should hear two clicks. 
sound(x'-1, 44100)
  1. transposed to conform to the expected inputs (a column vector)
  2. -1 to conform to the typical range of audio data
More info on playing sounds in matlab.
Related Question