http://newsoffice.mit.edu/2014/algorithm-recovers-speech-from-vibrations-0804
Researchers at MIT, Microsoft, and Adobe have developed an algorithm that can reconstruct
an audio signal by analyzing minute vibrations of objects depicted in video. In one set of
experiments, they were able to recover intelligible speech from the vibrations of a potato-chip
bag photographed from 15 feet away through soundproof glass.