Patent ID: 8607921
Filing Date: 2013-12-17
Classification: A61F,G10K

Abstract:
1. A process comprising (a) providing at least one hearing protection device comprising at least one sound barrier comprising at least one substantially periodic array of structures disposed in a first medium having a first density, said structures being made of a second medium having a second density different from said first density, wherein one of said first and second media is a viscoelastic medium having a speed of propagation of longitudinal sound wave and a speed of propagation of transverse sound wave, said speed of propagation of longitudinal sound wave being at least 30 times said speed of propagation of transverse sound wave, and wherein the other of said first and second media is a viscoelastic or elastic medium; and (b) interposing said hearing protection device between an acoustic source and an acoustic receiver in the form of a human ear.