Here you go: https://news.mit.edu/2014/algorithm-recovers-speech-from-vibrations-0804 https://news.mit.edu/2014/algorithm-recovers-speech-from-vib... Frequenc

Here you go: https://news.mit.edu/2014/algorithm-recovers-speech-from-vibrations-0804 https://news.mit.edu/2014/algorithm-recovers-speech-from-vib... Frequency attenuation + sub-pixel color profiling means you don't even need an expensive camera in a lot of cases. Get a plastic cup of water or similar object, put it on someone's desk, record video from far away, combine with something like this [0] and you've got a very interesting avenue for corporate espionage. If you could reconstruct typed passwords from the object, it's a really powerful technique. [0] https://people.eecs.berkeley.edu/~tygar/papers/Keyboard_Acoustic_Emanations_Revisited/tiss.preprint.pdf https://people.eecs.berkeley.edu/~tygar/papers/Keyboard_Acou...