Earphone device with impedance correction unit
US9137609B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 27, 2012 |
| Grant date | Sep 15, 2015 |
| Priority date | — |
| Expiry date | Jan 3, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R3/14
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Various aspects of this disclosure are directed to an earphone device comprising a speaker unit including at least one balanced armature transducer to convert an electrical signal into an acoustic signal. The electrical signal may define a frequency range comprising a first frequency and a second frequency. The earphone device may further comprise an impedance correction unit configured to receive the electrical signal and compliment an impedance of the speaker unit such that a sum of an impedance of the impedance correction unit and the impedance of the speaker unit at the first frequency is substantially similar to a sum of an impedance of the impedance correction unit and the impedance of the speaker unit at the second frequency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.