Active noise control earpiece being compatible with magnetic coupled hearing aids
US5740257A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 19, 1996 |
| Grant date | Apr 14, 1998 |
| Priority date | — |
| Expiry date | Dec 19, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R2225/51
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Active noise control for use by individuals using magnetically coupled hearing aids is realized by generating a true representation of the handset input signal, which is employed to drive a separate external field coil. The external field coil is positioned between the handset receiver and the handset acoustic output ports so that it is in close proximity to a user's ear cavity and, hence, to the magnetically coupled hearing aid. Also, in some embodiments of the invention, a magnetic shield is employed between the handset receiver and the external field coil to inhibit the magnetic leakage field from the receiver element from mixing with the magnetic field from the external field coil.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.