Acoustic apparatus
US5173575A · kind A · utility
25Cited by
14References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 21, 1989 |
| Grant date | Dec 22, 1992 |
| Priority date | — |
| Expiry date | Mar 21, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R1/2857
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A compact acoustic apparatus in which a vibrator is arranged in a Helmholtz resonator having a resonance port, and is driven to radiate a resonant acoustic wave so as to perform lower bass sound reproduction, is characterized in that a cabinet is reduced in size by externally projecting the resonance port from the cabinet, and/or a boundary condition change buffer means is arranged at an opening portion of the resonance port to prevent noise caused by an air flow flowing through the resonance port.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.