By all means, educate me on how non-linearity can make hair cells responsive to frequencies > 20kHz.
1) you have two frequencies at 23Khz and 25khz. Say they mix vith a quadratic non-linearity then you get a frequency at 2Khz
2) this is not simply aliasing
3) The case of 2 frequencies is degenerate but if I have multiple simultaeous frequencies mixing down below 20Khz then I can reconstruct the original spectrum under commonly true assumptions (such as sparsity).
There can also be non-linearities in time and phase as well. A trivial example is that a loud sound a moment before can block hearing a quiet sound a moment later.
Finally imagine how the ear actually works. It's not just a comb spectrum analyzer. It's actually sensitive at frequencies in between discrete values. Moreover in order for sound to reach the folicles the furthest in it has to pass by the folicals at the front, Therefore there is a great deal of mixing in time and frequency that can occur from this design.
I'm not saying this matters or that 192 K solves it if it does matter. I'm just saying the linear analyses assume their own conclusion and parade out Nyquists theorem as though it applied.
oops ill chosen values. use 16 samples per second for 2 seconds instead.
Add to the list of things you don't understand: Nyquists theorem.
Educational exercise 1: create 128 random Y values uniformly spaced along the X axis. Delete every other one and fourier transform it. Now pad this out to 2x the frequency and inverse fourier transform it. You get 128 Y values with the original spacing. But they are not the same points you started with.
Educational exercise 2: Create a sine wave at 3.14159 oscilations per second. Sample this at 16 samples per second for 1 second. throw away the second half so you have 8 samples. Fourier transform this. First observe there is no peak at 3.1459 hz because there's no discrete frequency there. Now inverse FT this. You dont get the original 16 points.
I don't think you understand non-linearity and how it can mix down a high frequency signal into an audio range. Another thing you dont understand is what happens when a frequencys period is not an integral multiple of the sample rate. In short are smokeless
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Not unless you use a hidden camera. If you use a visible camera and no one objects, you can assume their implicit permission. Hidden camera though, yes, that would be illegal, so would google glass on most European beaches.