Image-derived second-order directional microphones with finite baffle
US5742693A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 29, 1995 |
| Grant date | Apr 21, 1998 |
| Priority date | — |
| Expiry date | Dec 29, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R2430/21
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An acoustic transducer including an acoustical reflecting surface of a finite dimension and at least one sensor having an output which produces a first-order differential response pattern. The sensor is located proximate to the reflecting surface, wherein acoustical waves propagating from the reflecting surface, acoustically interact with the sensor to produce a second-order differential response pattern at the output of the sensor at a predetermined frequency. The second-order differential response pattern at the output of the sensor occurs at the predetermined frequency when the finite dimension of the reflecting surface is at least one-half of an acoustic wavelength.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.