Read the paper. You will see that the laser imagery is used to
synthesize sounds.
Le 28/06/2022 ¨¤ 18:52, Conrad Hoffman a
¨¦crit?:
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Have those people never seen a laser vibrometer??
Just point it and record the signal. Capable of hundreds of kHz.
Unfortunately, not cheap.
I think they've been used by spy agencies to pick up voices from
window panes.
