Passive acoustical filters incorporating inserts that reduce the speed of sound
US9087506B1 · kind B1 · utility
38Cited by
0References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 21, 2015 |
| Grant date | Jul 21, 2015 |
| Priority date | — |
| Expiry date | Jan 21, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R1/1016
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
There is disclosed a passive acoustical filter including a first filter element coupled between an ambient and an ear of a listener, at least a portion of the first filter element filled with a material in which a speed of sound is lower than a speed of sound in air.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.