Microphone with non-symmetrical directivity pattern
US4685137A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 17, 1985 |
| Grant date | Aug 4, 1987 |
| Priority date | — |
| Expiry date | May 17, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R1/38
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A microphone having unique polar response characteristics has a virtual axis of maximum pickup sensitivity which is angularly displaced from its physical horizontal longitudinal axis. Forward and rearward movement of a diaphragm is sensed by a sensing element mounted in spaced relationship to a rear side of the diaphragm. A substantially enclosed cavity is formed between the diaphragm rear side and the sensing element, with a non-symmetrical arrangement of at least one aperture for permitting sound pressure waves to enter said cavity, so that the polar response curve of the microphone in a horizontal plane is angularly displaced about a line perpendicular to the microphone's horizontal longitudinal axis.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.