Is it possible that signal may go down to negative values (amplitudes)?

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John_OR

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Assume that I have converted my voice into an electrical signal. Is it possible that signal may go down to negative values (amplitudes)?
So why sound files (like WAV) has negative values?
 

Voice signal

Yes of course; human voice or sounds in general comprise of linear sum of sinusoids with zero dc signal. thats why it can go to negative values.
 

    John_OR

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