Trimmable variable compression amplifier for hearing aid
US5838807A · kind A · utility
27Cited by
32References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 19, 1995 |
| Grant date | Nov 17, 1998 |
| Priority date | — |
| Expiry date | Oct 19, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R25/502
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An improved analog hearing aid is provided which incorporates a current source transconductance amplifier as an input stage. The gain defining bias current of the input stage transconductance amplifier is adjusted upon the application of battery power to the hearing aid to define a low input signal gain, and is then reduced by two gain regulators to define a compression threshold and compression ratio, and to provide a maximum output ceiling. Also provided is a method of trimming the low signal gain of the hearing aid at the time battery power is applied.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.