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SBC: COMMET LLC Topic: SB103006
A bi-stable meta-material which rejects high amplitude harmful sound but transfers sound levels needed for the situation awareness is proposed. A threshold intensity of the sound is determined by the material design and is set to 90 dBA all signals exceeding this level will be attenuated at least at 25 dB. More specifically, the material is composed by meta-structural elements having two stable s ...SBIR Phase I 2011 Department of DefenseDefense Advanced Research Projects Agency