Carnegie Mellon University researchers have developed an optical microphone capable of seeing sound vibrations with such precision and detail that it can reconstruct individual instruments of a band or orchestra. To test this, the team captured isolated audio of separate guitars playing at the same time and individual speakers playing different music simultaneously.
After capturing the isolated audio of the guitars, the team then analyzed the vibrations of a tuning fork, and used the vibrations of a bag of Doritos near a speaker to capture the sound coming from a speaker. Since this system uses two normal cameras, it only costs a fraction of the high-speed versions employed in past research while producing a higher quality recording. Plus, it can capture vibrations from objects in motion, like the movements of a guitar while a musician plays it, and simultaneously sense individual sounds from multiple points. This would complement MIT’s smart acoustic fabric, which is capable of hearing sounds.
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We’ve invented a new way to see sound. It’s a new type of camera system, a new imaging device, that is able to see something invisible to the naked eye,” said Mark Sheinin, a post-doctoral research associate at the Illumination and Imaging Laboratory (ILIM) in the RI.
