this post was submitted on 07 Jul 2023
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Plasma-based noise cancellation could silence rooms, cars and planes (newatlas.com)
submitted 2 years ago by [email protected] to c/[email protected]
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  • EPFL researchers have developed an ultra-thin active noise cancellation system based on an ionized air-plasma propulsion system.
  • The 17mm thick system blocks out 20Hz noise as well as a 4m thick wall.
  • Active noise cancellation (ANC) is based on the measurement and generation of pressure sound waves through speakers.
  • The EPFL Acoustic Group team tested the noise canceling capabilities of plasma ion speakers.
  • Ion speakers work like ion propulsion systems, using an electric field to ionize the air and create pressure waves.
  • The plasmacoustic metalayer system can completely suppress a sound wave as thin as one-thousandth of a wavelength.
  • EPFL has licensed the plasma-based technology from the Swiss company Sonexos for commercialization in various applications.
  • The study is publicly available on the Nature Communications website.
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