Potential applications include reducing urban noise pollution, silencing drone propellers
The 3D-printed acoustic metamaterial sends back sound. Pic/Boston University
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Engineers create breathable noise barrier
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Boston University engineers have developed an acoustic metamaterial that blocks 94 per cent of sound while allowing air to pass freely. In tests, a loudspeaker fitted with the device became inaudible until the material was removed. Potential applications include reducing urban noise pollution, silencing drone propellers.
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