Hearing aid
US4068090A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 1, 1976 |
| Grant date | Jan 10, 1978 |
| Priority date | — |
| Expiry date | Jul 1, 1996 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R25/502
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An improved hearing aid utilizing integrated field-effect transistors to reduce the size and power consumption thereof is provided. The hearing aid includes a microphone input device for producing signals representative of sound, an amplifier circuit for amplifying the signals produced by microphone input device, and a loudspeaker output device for producing sound representative of the sound sensed by the microphone input device at an amplified level. The invention is particularly characterized by a portion of at least the microphone input device, amplifier circuit and/or microphone output device being formed of MOS field-effect transistors.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.