Patent ID: 8066097

Claim:
An acoustic enhancement device adapted for being placed on a support and under a covering, and comprising a first flexible layer adapted for being placed facing the support, a second rigid layer joined to the first flexible layer and adapted for being placed opposite the support, and a damping element, wherein the damping element is integrated in the second rigid layer or forms a third layer placed on the second rigid layer and opposite the first flexible layer, wherein the flexible layer is a layer with open porosity, comprising one or more of fibrous material(s) of mineral and/or synthetic origin, glass fibers, polyester fibers, polyethylene and polyurethane, and having an apparent dynamic stiffness per unit area s′ t lower than 8.8×10 6 N/m 3 and wherein, when the damping element is integrated in the second rigid layer, the rigid layer has, at 20° C. and at 1000 Hz, a loss factor tan δ at least equal to 0.06, and, when the damping element forms a third layer, the third layer has, at 1000 Hz and 20° C., a loss factor tan δ at least equal to 0.3 and a dynamic Young's modulus E′ of between 5×10 6 Pa and 10 8 Pa.