Jul 7, 2023
Plasma-based noise cancellation could silence rooms, cars and planes
Posted by Arthur Brown in categories: media & arts, transportation
EPFL researchers have developed a 100% effective, ultra-thin active noise cancelling system that uses an ionized air plasma propulsion system instead of speakers. A 17-mm-thick (0.6-in) layer can block 20 Hz noise as well as a 4-m-thick (13-ft) wall.
If you know how active noise cancellation works, then skip ahead. Essentially, the sound waves we hear are pressure waves in the air around us. Speaker cones are big, lightweight membranes designed to push air around in precise patterns to create those pressure waves, either in the form of pleasant music, or whatever it is the kids are listening to these days.
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