This technology provides a sound absorbing structure comprising: an outer frame including an opening; a perforated plate member formed in the outer frame and including a rear surface facing the opening of the outer frame and a front surface opposite to the rear surface; and a rear sound absorber interposed between the rear surface of the perforated plate member and the opening of the outer frame, and an anechoic chamber comprising: a wall, a ceiling and a floor; and a plurality of sound absorbing structures of the embodiment fixed to at least the wall and the ceiling.

Provided is a composition for a sound insulating sheet member, a sound insulating sheet member, and a sound insulating structure body with excellent sound insulating performance. A sound insulating structure body including: a plurality of convex-shaped rubber-elastic resonant portions; and a sheet-like support that supports the resonant portions, wherein the resonant portions have a storage modulus G obtained from a composite curve of dynamic viscoelasticity according to ISO 6721-4 of 100 MPa or less at 25? C. and 10 kHz, and the areal density of the support is 1.0 kg/m.sup.2 or less.

An object of the present invention is to provide a structural body that has high vibration damping and high sound-insulating performance which exceeds mass law while being relatively light weight, that is highly flexible in design, excellent in versatility, and easy to manufacture so that productivity and economic efficiency can be improved. The object thereof is achieved with a sheet member having a sheet of rubber elasticity and a resonant portion, wherein the resonant portion is provided in contact with a surface of the sheet, the resonant portion including a base part and a weight part, and the weight part being supported by the base part and having a larger mass than the base part.

A structural body including a plurality of convex-shaped rubber-elastic resonant portions, and a sheet-like support that supports the resonant portions. A specific gravity of the resonant portions is 1.0 g/cm.sup.3 or more and 3.0 g/cm.sup.3 or less, a height of the resonant portions is from 50 ?m to 100 mm, and an areal density of the support is 1.0 kg/m.sup.2 or less.

A lightweight, durable mounting system for sound foam panels that provides a quick installation process and that solves the basic question of how a musician, home owner, renter, tenant, or person looking to make a room quieter can install sound absorbing foam panels in a fast, cheap, and un-harmful manner. The system includes an acoustical pad with selected sound absorption capabilities with an optional firm backing attached to the pad, an optional firm lay-in sheet with or without adhesive, a containment frame a fastening manner for removably securing the acoustical pad to the frame, and an installation way such as rings for hanging or adhesive pads for surface mounting to walls or ceilings.

An acoustic panel for use in an interior space is disclosed along with a system and method for using two or more of such panels to improve the acoustics of the interior space. Each acoustic panel comprises a substrate and a plurality of nodules affixed to the substrate wherein each nodule has a width and a substantially right triangular shape across the entire width with a first leg of the right triangular shape substantially perpendicular to the substrate, a base of the right triangular shape substantially parallel to the substrate and a hypotenuse, the first leg of each nodule having a height that is substantially less than a length of a quarter wave formed in the interior space by a lower frequency signal. For any one particular acoustic panel, the nodules are oriented such that their hypotenuse slopes right, left, down or up as determined for each nodule by a predetermined, generally desired direction for redirecting the sound while providing fractal-chaotic differentiality in the portion of the sound waves that are reflected by the acoustic panel.

An object of the present invention is to provide a sound insulating sheet member that has high sound-insulating performance which exceeds mass law while being relatively light weight, that is highly flexible in design, excellent in versatility, and easy to manufacture so that productivity and economic efficiency can be improved, and a sound insulating structural body or the like using the same. The object thereof is achieved by using a sound insulating sheet member comprising at least a sheet having rubber elasticity and a plurality of resonant portions, wherein the resonant portions are provided in contact with a sheet surface of the sheet, each of the resonant portions including a base part and a weight part, and the weight part being supported by the base part and having a larger mass than the base part.

This technology provides a sound absorbing structure comprising: an outer frame including an opening; a perforated plate member formed in the outer frame and including a rear surface facing the opening of the outer frame and a front surface opposite to the rear surface; and a rear sound absorber interposed between the rear surface of the perforated plate member and the opening of the outer frame, and an anechoic chamber comprising: a wall, a ceiling and a floor; and a plurality of sound absorbing structures of the embodiment fixed to at least the wall and the ceiling.

An acoustic panel for use in an interior space is disclosed along with a system and method for using two or more of such panels to improve the acoustics of the interior space. Each acoustic panel comprises a substrate and a plurality of nodules affixed to the substrate wherein each nodule has a width and a substantially right triangular shape across the entire width with a first leg of the right triangular shape substantially perpendicular to the substrate, a base of the right triangular shape substantially parallel to the substrate and a hypotenuse, the first leg of each nodule having a height that is substantially less than a length of a quarter wave formed in the interior space by a lower frequency signal. For any one particular acoustic panel, the nodules are oriented such that their hypotenuse slopes right, left, down or up as determined for each nodule by a predetermined, generally desired direction for redirecting the sound while providing fractal-chaotic differentiality in the portion of the sound waves that are reflected by the acoustic panel.

An object of the present invention is to provide a structural body that has high vibration damping and high sound-insulating performance which exceeds mass law while being relatively light weight, that is highly flexible in design, excellent in versatility, and easy to manufacture so that productivity and economic efficiency can be improved. The object thereof is achieved with a sheet member having a sheet of rubber elasticity and a resonant portion, wherein the resonant portion is provided in contact with a surface of the sheet, the resonant portion including a base part and a weight part, and the weight part being supported by the base part and having a larger mass than the base part.