So here's the sound that we played in the room.And this is a high-speed video we recorded of that bag of chips.Again it's playing.There's no chance you'll be able to see anything going on in that video just by looking at it,but here's the sound we were able to recover just by analyzing the tiny motions in that video.I call it Thank you.I call it the visual microphone.We actually extract audio signals from video signals.And just to give you a sense of the scale of the motions here,a pretty loud sound will cause that bag of chips to move less than a micrometer.That's one thousandth of a millimeter.That's how tiny the motions are that we are now able to pull outjust by observing how light bounces off objects and gets recorded by our cameras.We can recover sounds from other objects, like plants.And we can recover speech as well.So here's a person speaking in a room.Michael Rubinstein: And here's that speech again recovered just from this video of that same bag of chips.
