Frequency selection circuit for hearing aids
US4790018A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 11, 1987 |
| Grant date | Dec 6, 1988 |
| Priority date | — |
| Expiry date | Feb 11, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R25/502
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A signal processing circuit for hearing aids includes a broadband peak detector for generating a control voltage based upon the sound pressure level of an incoming acoustical signal over its entire frequency spectrum. The control signal is used to determine the cut-off frequency of a voltage controlled adaptive high-pass filter. An amplified electrical signal, corresponding to the acoustical signal, also is provided to the high-pass filter. In setting the cut-off frequency, the control voltage causes the high-pass filter to selectively suppress the low frequency portion of the signal, generating a modified signal in which the noise component is reduced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.