Hearing-aid with integrated circuit electronics
US4539441A · kind A · utility
9Cited by
6References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 19, 1982 |
| Grant date | Sep 3, 1985 |
| Priority date | — |
| Expiry date | Aug 19, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R19/04
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A hearing-aid has an electronic voltage stabilizing circuit (16) to compensate for change in supply voltage due to battery (18) aging and use. The electret microphone (11) is located within a housing, the voltage stabilizing circuit (16) being located within the same microphone housing, thus requiring no additional space or terminal connections. Preferably, an impedance transformer is provided; the electronic components (31-34) are placed on the same semi-conductor chip as the components (35, 36) of the voltage stabilizing circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.