Hearing aid
US4490585A · kind A · utility
49Cited by
6References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 8, 1982 |
| Grant date | Dec 25, 1984 |
| Priority date | — |
| Expiry date | Oct 8, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R25/356
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A hearing aid is made up of an automatic filter circuit for transmitting an input signal in a predetermined characteristic, and a low frequency component detecting circuit for detecting the low frequency component of the input signal, to change the characteristic of the automatic filter circuit according to the detection level, the cut-off frequency of the automatic filter circuit being changed according to the output control signal of the low frequency component detecting circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.