used surreptitiously since the ‘70s, at least.
Good, good, good vibe ray shuns!
(You’re welcome.)
“allowing us to turn everyday objects—a glass of water, a potted plant, a box of tissues, or a bag of chips—into visual microphones.” Windows, too.
Decades ago, third floor, E-ring of the Pentagon, electrical vibration devices were attached to the windows to distort and make unreadable any vibrations from people speaking in the room.
Aim a laser at an unprotected window and variations in the laser return can be used as a microphone to pick up speech.
Interesting way of avoiding the Nyquist limit with a 30 frame per second video.
The cops already use this with lasers on windows and walls. But like any good authoritarian would say...”If you haven’t done anything wrong, you have nothing to worry about. Trust me...”