Now, Optical microphones?

Analogous

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Researchers… have presented some remarkable audio from a new optical microphone system that uses cameras to see and reconstruct sonic vibrations. Remarkably, it can cleanly separate a single instrument playing in a group.

This kind of sonic isolation is extremely difficult even for high-end audio microphones, so to be able to achieve it using nothing but two cameras and a laser? It feels a bit like black magic. But the results, which you can see in the video embedded at the end of this piece, are stunning….”

 
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