They use something called the active “plasmacoustic metalayer.”
“As expected, the communication between the electrical control system of the plasma and the acoustic environment is much faster than with a membrane.”The plasma has the added benefit that it can be tuned to work at low frequencies as well as high ones and is more compact than most conventional solutions.
“100 percent of the incoming sound intensity is absorbed by the metalayer and nothing is reflected back,” said EPFL’s Acoustic Group’s senior scientist Hervé Lissek. This results in a compact plasma absorber that can tune out an audible sound frequency of 20 Hz with a plasma layer of only 17 mm thick. Most conventional noise reduction solutions, like absorbing walls, need to be at least 4 m thick, severely limiting feasibility.
“The most fantastic aspect in this concept is that, unlike conventional sound absorbers relying on porous bulk materials or resonant structures, our concept is somehow ethereal. We have unveiled a completely new mechanism of sound absorption, that can be made as thin and light as possible, opening new frontiers in terms of noise control where space and weight matter, especially at low frequencies” says Hervé Lissek.
“This strategic collaboration leverages EPFL's expertise in material science and acoustics, as well as Sonexos' proven track record in delivering high-performance audio solutions,” explained
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