Directional microphone with high frequency selective acoustic lens
US4401859A · kind A · utility
23Cited by
3References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 29, 1981 |
| Grant date | Aug 30, 1983 |
| Priority date | — |
| Expiry date | May 29, 2001 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R1/342
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A unidirectional dynamic microphone provided with a first sound path to the forward side of the diaphragm and a second sound path to the rear side of the diaphragm, a Helmholtz resonator disposed in the first sound path having a sound entrance, and a diffraction lens mounted ahead of the Helmholtz resonator and partially shadowing the sound entrance to the Helmholtz resonator for the purpose of increasing the high frequency response of the microphone.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.