# US 2025/0095623 A1 · Angle independent acoustic structures for broadband sound absorption and sound transmission loss > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2025/0095623 A1 - Document ID: US20250095623A1 - Status: Published application - Kind: A1 - Application number: 18/470,560 - Filed: 2023-09-20 - Published: 2025-03-20 - Earliest claimed: 2023-09-20 - Assignees: Toyota Motor Engineering & Manufacturing North America, Inc.; Toyota Jidosha Kabushiki Kaisha - Applicants: Toyota Motor Engineering & Manufacturing North America, Inc.; Toyota Jidosha Kabushiki Kaisha - Inventors: Tomohiro Miwa; Miki Nakahara; Reimi Emoto; Mizuki Sakamoto; Toyohiro Sone; Xiaoshi Su; Debasish Banerjee - Web page: https://patentgrep.com/patent/US20250095623A1 ## CPC - G10K 11/172: using resonance effects - G10K 11/162: Selection of materials - G10K: SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR ## Abstract An acoustic structure includes an acoustic scatterer with a plurality of repeating cells and a corresponding plurality of resonant channels such that the acoustic scatterer is an angle independent acoustic absorber. The plurality of resonant channels each have an open end and a terminal end, and foam extends across the open ends of the plurality of resonant channels. And a layer of foam extending around the acoustic structure and/or or positioned at open ends of the resonant channels broadens the absorption and sound transmission loss bandwidth. ## Claims ### Claim 1 An acoustic structure comprising: an acoustic scatterer comprising a plurality of repeating cells with a corresponding plurality of resonant channels such that the acoustic scatterer is an angle independent acoustic absorber; and foam extending along an outer surface of the acoustic scatterer. ### Claim 2 (depends on 1) The acoustic structure according to claim 1, wherein the plurality of resonant channels each comprise an open end and a terminal end, and the foam comprises discrete pieces of foam located at the open ends of the plurality of resonant channels. ### Claim 3 (depends on 2) The acoustic structure according to claim 2, wherein the discrete pieces of foam are positioned within the open ends of the plurality of resonant channels. ### Claim 4 (depends on 1) The acoustic structure according to claim 1, wherein the foam extends continuously along the outer surface of the acoustic scatterer. ### Claim 5 (depends on 1) The acoustic structure according to claim 1, wherein the foam is a sleeve of foam positioned on the outer surface of the acoustic scatterer. ### Claim 6 (depends on 1) The acoustic scatterer according to claim 1, wherein each of the plurality of repeating cells has two or more resonant channels. ### Claim 7 (depends on 6) The acoustic scatterer according to claim 6, wherein the two or more resonant channels are identical resonant channels. ### Claim 8 (depends on 6) The acoustic scatterer according to claim 6, wherein the two or more resonant channels are distinct resonant channels. ### Claim 9 (depends on 1) The acoustic structure according to claim 1, wherein the plurality of repeating cells are triangular prism shaped and positioned about a central axis of the acoustic scatterer, and the acoustic scatterer is cylindrical shaped. ### Claim 10 (depends on 1) The acoustic structure according to claim 1 further comprising a cover plate attached to an end of the acoustic scatterer. ### Claim 11 (depends on 10) The acoustic structure according to claim 10 further comprising another cover plate attached to another end of the acoustic scatterer. ### Claim 12 (depends on 1) The acoustic structure according to claim 1 further comprising a first cover plate attached to a first end of the acoustic scatterer and a second cover plate attached a second opposing end of the acoustic scatterer. ### Claim 13 (depends on 1) The acoustic structure according to claim 1, wherein the plurality of repeating cells is four repeating cells. ### Claim 14 (depends on 1) The acoustic structure according to claim 1, wherein the plurality of repeating cells are identical repeating cells. ### Claim 15 (depends on 1) The acoustic structure according to claim 1, wherein the plurality of repeating cells comprises a first set of repeating cells and a second set of repeating cells that are not identical to the first set of repeating cells. ### Claim 16 An acoustic structure comprising: a plurality of acoustic scatterers each comprising a plurality of repeating cells with a corresponding plurality of distinct resonant channels such that the plurality of acoustic scatterers are angle independent broadband acoustic scatterers; and foam extending along an outer surface of at least one of the plurality of acoustic scatterers. ### Claim 17 (depends on 16) The acoustic structure according to claim 16, wherein the plurality of distinct resonant channels each include an open end and a terminal end, and the foam is discrete pieces of foam located at the open ends of the plurality of distinct resonant channels of the plurality of acoustic scatterers. ### Claim 18 (depends on 16) The acoustic structure according to claim 16, wherein the foam extends continuously along the outer surface of the at least one of the plurality of acoustic scatterers. ### Claim 19 An acoustic structure comprising: a cylindrical shaped acoustic scatterer comprising a plurality of repeating cells with a corresponding plurality of distinct resonant channels such that the cylindrical shaped acoustic scatterer is an angle independent broadband acoustic absorber; two cover plates attached to opposing ends of the cylindrical shaped acoustic scatterer; and foam extending along an outer surface of the cylindrical shaped acoustic scatterer. ### Claim 20 (depends on 19) The acoustic structure according to claim 19, wherein the foam extending along the outer surface of the cylindrical shaped acoustic scatterer is selected from the group consisting of discrete pieces of foam extending across open ends of the plurality of distinct resonant channels and a sleeve of foam extending continuously along the outer surface of the cylindrical shaped acoustic scatterer.