David Schwartz, who laid the foundation for MP3 with his undergraduate and graduate work in the ’80s, has another big idea: a microphone that uses lasers and smoke to detect the minute variations in air pressure the rest of us call “sound.”
His invention appears to be the world’s first laser microphone, and it works by streaming smoke across a laser beam aimed at a “very, very fast and sensitive” photocell designed for fiber-optic networks. The photocell converts variations in the beam into electrical signal that carries the audio signal.
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