Passive audio ear filters with multiple filter elements
US9131308B2 · kind B2 · utility
33Cited by
4References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 21, 2015 |
| Grant date | Sep 8, 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 two or more filter elements coupled between an ambient and a listener's ear, each of the filter elements selected from the group consisting of a low pass filter element, a high pass filter element, a band reject filter element, and a band pass filter element.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.