Speakers work by moving rapidly out/in to make a wave form.. So they start at a mid point (as 0 volts ) and then move out (as a + voltage, and in (as a - voltage), to make the the first cycle.. It is this pushing and pulling of cone which makes the sound. Once the cycle starts moving above 16 - 20 cycles a second we begin to discern a pitch.. Middle A is the waveform crossing 0 volts 440 times a second. Faster and slower waveform crossings either above 0 volts, or below 0 volts will color the pitch (harmonics), otherwise a perfectly symmetrical wave form (out/in) would be a sine. I believe you need to look at the plus and minus voltage of the wave form to determine it's pitch properly. If you look at the first wave form you'll notice the above 0 volts is shorter in duration, then the minus voltage.. So doubling the below 0 voltage, is not going to give you an accurate viewpoint (rather earing point) of waveform cycle..
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