A multi-resonator-based system responsive to acoustic waves includes at least two resonators, each including a bottom plate, side walls secured to the bottom plate, and a top plate disposed on top of the side walls. The top plate includes an orifice so that a portion of an incident acoustical wave compresses...http://www.google.co.uk/patents/US7212641?utm_source=gb-gplus-sharePatent US7212641 - Electromechanical acoustic liner
