Force balance microphone
US6285769A · kind A · utility
19Cited by
2References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 10, 1997 |
| Grant date | Sep 4, 2001 |
| Priority date | — |
| Expiry date | Apr 10, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R3/002
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The present invention is a microphone that applies the principle of negative feedback directly to the diaphragm, greatly reducing the non-linearity of the diaphragm. In a further embodiment, digital negative feedback is used, incorporating the diaphragm into the digitization loop of a sigma-delta converter, creating a direct sound pressure to digital electrical output converter. In one embodiment, positive feedback is used in an analog circuit, causing a negative feedback response on the diaphragm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.