Loudspeaker with high frequency motional feedback
US4573189A · kind A · utility
29Cited by
8References
35Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 19, 1983 |
| Grant date | Feb 25, 1986 |
| Priority date | — |
| Expiry date | Oct 19, 2003 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R3/002
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A moving-coil loudspeaker system incorporating motional feedback operable at high frequencies, i.e. above about 1000 Hz. The feedback signal is developed by a tiny piezo-electric accelerometer mounted together with a charge amplifier directly on the loudspeaker coil, in alignment with the turns of the coil. The coil comprises two layers of rectangular, anodized aluminum wire wound tightly to form an effectively integral mass. The system includes a suitable stabilizing frequency compensation network.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.