Acoustic absorber, acoustic wall and method for design and production
US10477302B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Feb 8, 2017 |
| Grant date | Nov 12, 2019 |
| Priority date | — |
| Expiry date | Feb 8, 2037 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE04B2001/8485
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A passive sound absorber includes a cavity opening to the outside via an input direction to form a Helmholtz resonator for a first frequency. The absorber further includes at least one moving element, or wafer, suspended or held by suspensions in a position obstructing the neck in a non-sealed manner. The relative stiffness of the suspensions and the wafer is determined so that the assembly resonates in a vibration in a “piston” movement at a second frequency different from the first frequency, achieving absorption for this second frequency or frequency range. A hybrid version includes a coil that is controlled to adjust the acoustic impedance of the absorber.An acoustic wall includes a plurality of such absorbers produced by a repetitive structure opening through perforations, each receiving such a wafer, and a method of designing and manufacturing such an absorber or wall is also provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.