Noise measurement
US4522283A · kind A · utility
10Cited by
3References
15Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 4, 1982 |
| Grant date | Jun 11, 1985 |
| Priority date | — |
| Expiry date | Jun 4, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04S7/30
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A sound absorbent pad, which comprises an interconnected cellular foam or a fibrous material, has a central hole which houses a microphone whose sound-sensing diaphragm is held flush with the center of the outer surface of the pad. The pad is a shallow dome or other shape which converges from a large base to a vertex and incorporates a plastic or metal plate, which being frusto-conical or another suitable shape. The pad with its plate acts to control noise which would otherwise be reflected from noise reflecting surface onto the microphone, thereby facilitating measurement of freefield noise levels.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.