Spider-less loudspeaker with active restoring apparatus
US6694037B1 · kind B1 · utility
5Cited by
9References
37Claims
0Family size
Inventors
Key dates
| Filing date | Dec 10, 1999 |
| Grant date | Feb 17, 2004 |
| Priority date | — |
| Expiry date | Dec 10, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R9/06
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A spider-less and suspension-less speaker system, having a diaphragm constrained to move in a linear direction and supported by a frictionless or low friction support. A voice coil coupled to an audio input drives the speaker diaphragm. A position sensor determines the physical position of the diaphragm. A control circuit uses the sensed position information to modify the audio signal in such a way that the interaction of the voice coil and the magnetic field both drives the diaphragm to produce an audible output and restores the diaphragm to a neutral position in the absence of a further audio signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.