Microphone capable of cancelling mechanical generated noise
US4127749A · kind A · utility
86Cited by
4References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 31, 1977 |
| Grant date | Nov 28, 1978 |
| Priority date | — |
| Expiry date | Mar 31, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S310/80
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A microphone comprises a pair of electroacoustic transducing high polymer piezoelectric semi cylindrical shaped membranes having a single axis of elongation tangent to the curvature mounted in a housing facing each other. The membranes are electrically series connected to each other with a connection between the facing surfaces thereof and are of prescribed polarizations to generate an output which is substantially twice the voltage developed individually from each membrane when said membranes are caused to flex in opposite directions and substantially zero when said membranes are caused to flex in the same direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.