Earphone
US8116511B2 · kind B2 · utility
1Cited by
6References
1Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Jul 27, 2007 |
| Grant date | Feb 14, 2012 |
| Priority date | — |
| Expiry date | Dec 13, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R1/1016
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An earphone with adjustable impedance is provided. The earphone mainly includes an earphone body, a communication line, an earphone plug, an alter switch and an adjustable impedance unit used for adjusting an impedance of the earphone. The adjustable impedance unit is connected between the earphone plug and the earphone body through the alter switch. The impedance of the earphone can be matched on the output impedance of the media player by adjusting the impedance of the adjustable impedance unit when an earphone is connected with a media player.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.