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«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.» - http://newsoffice.mit.edu/2014/algorithm-recovers-speech-from...
«In other experiments, they extracted useful audio signals from videos of aluminum foil, the surface of a glass of water, and even the leaves of a potted plant … the researchers used a high-speed camera that captured 2,000 to 6,000 frames per second.» ‎· 9000
In 1980s, this was ultra-high-tech and required laser illumination of windows to eavesdrop. ‎· 9000
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