It's called the Visual Microphone, and is built around the passive recovery of sound from video of an object.
Although for best results a high speed camera with a frequency higher than the audio frequency you're trying to capture is needed, the following video also shows how an everyday low speed camera with a "rolling shutter" can work as well.
And be careful about what you say around that empty bag of chips from now on! There's no telling who's listening.
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1 comment:
That's brilliant!
I've always suspected that this could be achieved. The late Stephen StCroix was a forerunner in the science of recorvering audio. His research papers are still a good read. He claimed he could recover room sounds/dialog from the brush strokes of old paintings. The govt would not let him try and sus out the Nixon tapes though. Too bad, that would have been interesting.
Cheers
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