Acoustic apparatus
US5012890A · kind A · utility
57Cited by
5References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 15, 1989 |
| Grant date | May 7, 1991 |
| Priority date | — |
| Expiry date | Mar 15, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R3/002
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In an acoustic apparatus in which a vibrator is arranged in a Helmholtz's resonator having an open duct port, and the vibrator is driven to radiate a resonant acoustic wave, a duct resonance absorbing means is provided to the open duct port constituting the Helmholtz's resonator so as to remove an unnecessary resonant sound other than a Helmholz's resonant sound caused when the Helmholtz's resonator is driven, thereby removing noise in a radiated acoustic wave and improving distortion characteristics.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.