![]() In other experiments, however, they used an ordinary digital camera. That’s much faster than the 60 frames per second possible with some smartphones, but well below the frame rates of the best commercial high-speed cameras, which can top 100,000 frames per second. In some of their experiments, the researchers used a high-speed camera that captured 2,000 to 6,000 frames per second. Reconstructing audio from video requires that the frequency of the video samples - the number of frames of video captured per second - be higher than the frequency of the audio signal. People didn’t realize that this information was there.” “The motion of this vibration creates a very subtle visual signal that’s usually invisible to the naked eye. “When sound hits an object, it causes the object to vibrate,” says Abe Davis, a graduate student in electrical engineering and computer science at MIT and first author on the new paper.
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