Switched amplifier
US5317640A · kind A · utility
10Cited by
5References
1Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 30, 1991 |
| Grant date | May 31, 1994 |
| Priority date | — |
| Expiry date | Oct 30, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R25/505
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a hearing aid having a switched amplifier, an amplifier circuit is provided so that the pulse amplitude of the switched output signal is adjusted as a function of the envelope of the audio signal to be amplified. A controllable amplifier is switched in series ahead of the switched amplifier, whereby its control by the audio signal to be amplified proceeds in such a manner that the product of the amplifications of the two amplifiers remains constant for all audio signal levels.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.