MATLAB Answers


Which parameter of my audio file does Y refer to, where Y=wavread('sound.wav') ? Is it the volume or any other parameter?

Asked by Janani
on 6 Jan 2013

I need the pitch contour plotted for two audio files. I used wavread() function but i am unsure which parameter of the audio data 'Y' represents. Kindly guide me.

I need to compare the pitches of two audio files.



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1 Answer

Answer by Walter Roberson
on 6 Jan 2013

Y represents amplitude, probably in the scale -1 <= Y < 1 .


Jan Simon
on 6 Jan 2013

@Walter: This answer is absolutely clear on first sight. But which amplitude is this exactly? The mean over the time of 1/Freq of the voltage measured by the AD converter? Does it linearly depend on pressure at the membrane of the microphone?

No volts are necessarily harmed in the creation of the file. Could be on any arbitrary scale, created by any arbitrary process. Recordings of water levels over an aeon for example.

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