Hearing aid having input and output gain compression circuits
US5862238A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 11, 1995 |
| Grant date | Jan 19, 1999 |
| Priority date | — |
| Expiry date | Sep 11, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R25/502
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A hearing aid uses multiple compression feedback loops to minimize sound distortion includes a preamplifier network having an input connected to an input receiver, an output, and an automatically adjustable gain. The preamplifier network measures an output signal which is preferably a voltage and automatically adjusts the gain in response to the output signal. The hearing aid also includes an output drive network having an input connected to the preamplifier network output and an output connected to a load, such as a transducer. The output drive network has an automatically adjustable gain which is responsive to a measured signal at the output of the network. A volume control circuit may also be connected between the output of the preamplifier network and the input of the output drive network to permit the person wearing the hearing aid to adjust the output volume.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.