Acoustic filter
US9549242B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 25, 2015 |
| Grant date | Jan 17, 2017 |
| Priority date | — |
| Expiry date | Oct 27, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R2400/13
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A loudspeaker comprising includes an enclosure, a driver element located within the enclosure and including a cone diaphragm, a first cavity defined by a first cavity wall and the cone diaphragm, the first cavity extending from the cone diaphragm and having a first opening which has an area less than an area of the cone diaphragm, an exit element extending from the first opening of the first cavity and acoustically coupling the first cavity to an environment outside of the enclosure, a second cavity, defined by a second cavity wall within the enclosure extending from a second opening in the first cavity, and an acoustic element in the second opening acoustically coupling the second cavity to the first cavity. The second cavity is not otherwise acoustically coupled to the environment outside of the enclosure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.