Acoustic filter
US9173018B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 27, 2012 |
| Grant date | Oct 27, 2015 |
| Priority date | — |
| Expiry date | Oct 3, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R2400/13
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In an aspect, in general, a loudspeaker element includes an enclosure, a cone diaphragm of a driver element located within the enclosure, a first cavity wall extending from the cone diaphragm of the driver element to a throat opening which has an area less than an area of the cone diaphragm and forming a first cavity within the enclosure, an exit element extending from the throat opening to an environment outside of the enclosure, and an impedance compensation element extending from the first cavity wall, the impedance compensation element including a second cavity wall which forms a second cavity within the enclosure and a resistance element separating the second cavity from the first cavity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.