Histogram and sound amplitude

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TESFAW
TESFAW 2014-8-16
评论： Image Analyst 2014-8-16
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?
  1 个评论
TESFAW
TESFAW 2014-8-16
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

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回答（1 个）

Image Analyst
Image Analyst 2014-8-16
x is like time, and y is like amplitude or signal voltage.
  1 个评论
Image Analyst
Image Analyst 2014-8-16
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.

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