Microphone and method of testing a microphone
US11089419B2 · kind B2 · utility
6Cited by
1References
13Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 26, 2018 |
| Grant date | Aug 10, 2021 |
| Priority date | — |
| Expiry date | Feb 26, 2038 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R2201/003
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The microphone comprises a housing (1, 2), which has an inner volume (12) filled with a gas, an opening (10) of the housing, an acoustic sensor (3) arranged in the housing, a diaphragm (13) of the acoustic sensor located above the opening, and a heater (14) in the inner volume. The acoustic sensor may especially comprise a microelectromechanical system. The gas is heated from inside the inner volume to increase the pressure and generate a corresponding signal of the acoustic sensor (3). This signal can be used for self-calibration of the sensitivity or for self-diagnostics to check the function of the microphone.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.