Transducer with motion control
US9301072B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 1, 2013 |
| Grant date | Mar 29, 2016 |
| Priority date | — |
| Expiry date | Mar 23, 2033 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R2499/11
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An audio system comprises an electro-acoustic transducer (1) with transducer connections (12, 13) to receive an audio signal (AS) in the audio frequency range from a driver circuit (14) and measure means (11) to measure the excursion of a diaphragm (3) of the electro-acoustic transducer (1), wherein a sensor signal source (16) provides a sensor signal (SS) at the transducer connections (12, 13) with a sensor frequency beyond the audio frequency range and in the range of the resonance frequency of the electro-acoustic transducer and, wherein the measure means (11) comprise a sensor circuit (18) to sense changes of the impedance of the electro-acoustic transducer (1) for the sensor signal (SS) at the transducer connections (12, 13) caused by the excursion of the diaphragm (3) due to the audio signal (AS).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.