Histogram and sound amplitude

Hi everybody!

I need help on histogram for sound data analysis

How can I interpret the X axis and y axis for the histogram plot of signal(sound)

For the code

plot(y);
hist(y,linspace(-1,1,51));
axis([-0.6,0.6,0,5000])

where y=wavread(file)

any help?

[TESFAW]

      10Q!  I know that yes!

     but what x  and y actually represent for sound is my question

      my opinion is 

     for x amplitude (pressure variation),

      for y number of samples in that amplitude range

      I am not sure

      plz correct me

Answer 1

[Image Analyst]

x is like time, and y is like amplitude or signal voltage.

[Image Analyst]

There is no "x" in your code, just y. If you plot y the "x" axis is really "element number" and y is sound signal. If you plot the histogram, the "x" is the "y" bins (the y gets quantized), and the "y" is the counts, meaning the number of elements that have y values in the bin range. Each bin overs a different range of y, and the histogram counts up the number of elements in that range.