ACOUSTIC TRANSPARENCY MATERIAL, ACOUSTIC ADJUSTMENT SURFACE STRUCTURE USING THE SAME AND INCLUDING BUILDING USE, WINDSHIELD FOR MICROPHONE, GRILLE FOR PROTECTION, ACOUSTIC TRANSPARENCY PROJECTION SCREEN AND LOUDSPEAKER

摘要

PROBLEM TO BE SOLVED: To provide an acoustic transparency material having independency and high performance acoustic transparency using a material formed by entangling fibers with each other.;SOLUTION: The acoustic adjustment surface structure includes: an acoustic transparency material formed by entangling fibers with each other and having taper rigidity of 5 mN m or more, bending resistance of 100 mN or more, porosity of 50% or more, and thickness of 3 mm or less; and an acoustic adjustment mechanism having an acoustic absorption structure and/or a reflective structure mounted on the rear surface thereof.;COPYRIGHT: (C)2015,JPO&INPIT