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Audio is a sequence of waveforms which have peaks, troughs, 0, just like below. audio_waveform

How to define the x axis (y = 0) in the picture, how to choose the 0 point in the waveform since there are so many points on the waveform?

Why not move the waveform above or below the x axis(y=0)?

This question seems a little stupid. But I still hope someone can help with it.

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You can't produce a DC component with speech, so the line $y=0$ is defined by the speech signal having zero mean.

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  • $\begingroup$ You are right Matt, but DC offset can be very often added by recording device itself. $\endgroup$ – jojek Aug 12 '14 at 8:07
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    $\begingroup$ @jojek: That's true but that would be an artefact and the DC component does not carry any information about the speech signal. $\endgroup$ – Matt L. Aug 12 '14 at 8:31

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