Anechoic structural elements and chamber
AssigneeIndustrial Acoustics Company, Inc.
InventorJohn Duda
Life of this patent
Estimating the term…
Abstract
A substantially enclosed sound absorbing unit for an anechoic chamber is disclosed. The sound absorbing unit includes a substantially flat panel member comprising a layer of sound absorptive material. An anechoic member is disposed adjacent to the flat panel member. The anechoic member is disposed adjacent to a base and a generally spaced apart sound transparent wall member. The wall member includes a layer of sound absorptive material and a cover sheet made of perforated, substantially sound reflective material. The free space of the perforated cover sheet is at least 7 percent of the total area of the cover sheet.
Claims23
A substantially enclosed sound absorbing unit for an anechoic chamber which provides a maximum deviation from the inverse square law of about 3 dB comprising:
- a substantially flat panel member having a layer of sound absorptive material;
- an anechoic member disposed adjacent to said flat panel member said anechoic member having a base and a pair of generally spaced apart sound transparent wall members, said wall members including a layer of sound absorptive material, said wall members further including a substantially solid, sound reflective, protective cover sheet thereover having perforations formed therein, said perforations forming a free space and in which said free space of said perforated cover sheet is at least about 7% of the total area of the cover sheet.
An assembly for forming a wall or ceiling in an anechoic chamber which provides a maximum deviation from the inverse square law of about 3 dB comprising:
- a first substantially flat panel member formed from a sound absorptive material;
- and
- an anechoic wedge panel spaced apart from said first panel member, said wedge panel including a plurality of wedge members each of which is generally triangular in cross-section, each wedge member having a base member and a pair of inclined wall members, each of said base members being formed from an integral perforated metal sheet, said perforations forming a free area, said base members and said wedge members being integral with one another so that said bases form a support panel generally parallel to and spaced apart from said first panel member, each of said wedge wall members including a layer of sound absorptive material and a substantially solid, sound reflective, protective perforated metal cover sheet, said perforations forming a free area, said free areas of said perforated base members and said cover sheets being in the range of about 7% to 50% of the entire area of each respective base member and cover sheet.
A substantially enclosed sound absorbing unit for an anechoic chamber which provides a maximum deviation from the inverse square law of about 3 dB comprising:
- a substantially flat panel member having a layer of sound absorptive material;
- an anechoic member disposed adjacent to said flat panel member said anechoic member having a base and a pair of generally spaced apart sound transparent wall members, said wall members including a layer of sound absorptive material, said wall members further including in integral cover sheet thereover made of perforated, substantially sound reflective material, said perforations forming a free space therein and in which said free space of said perforated cover sheet is at least about 7% of the total area of the cover sheet, wherein said anechoic member has a substantially triangular cross-section, said anechoic member being substantially hollow, including an inside layer of sound absorptive material disposed on said base, in which said inside layer of sound absorptive material has a substantially rectangular cross-section in which the width of said rectangular cross-section is smaller than the width of said base.
Dependencies are inferred from the claim text.