Electro-magnetic microphone
US6721429B1 · kind B1 · utility
Assignees
Inventors
Key dates
| Filing date | Jun 29, 2000 |
| Grant date | Apr 13, 2004 |
| Priority date | — |
| Expiry date | Jun 15, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R19/04
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A microphone is provided with a simple structure by which a lead wire is not required to detect displacement of a vibrated film. The microphone is equipped with a vibrated film 2 to receive sonic waves on either surface and to receive electro-magnetic waves on other surface, a device 4 to receive and transmit the electro-magnetic waves reflected by the vibrated film, a counter to count pulses from the device to receive and transmit electro-magnetic waves, a processing logic 5 to count the pulses output from the counter. Displacement of the vibrated film is converted into electric signals by counting the processing logic the frequency and amplitude of the electro-magnetic waves reflected by the vibrated film 2.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.