Arrangement for active sound damping
US5466899A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 2, 1994 |
| Grant date | Nov 14, 1995 |
| Priority date | — |
| Expiry date | Dec 2, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10K2210/32272
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
It is known in the state of the art to dampen noise emissions by means of "anti-sound". In the gas exhaust installations of combustion machines, this is realized most often in that the exhaust gas flowing in the gas exhaust installation is charged with "anti-sound" produced by loudspeakers (12). However, such arrangements are disadvantageous in that the flow of hot exhaust gases reduces the service life of the loudspeakers, or that such measures are insufficient for actively damping the sound. The invention therefore presents an arrangement that avoids the disadvantages that exist in the state of the art. According to the invention, this is achieved in that the gas exhaust tube (10) ends in one of the two chambers of a double chamber box (17), and that a bass reflex tube (21) protrudes into this chamber of the double chamber box (17). The excellent sound cancellation at low loudspeaker output is achieved because the sound cancellation takes place in the chamber of box (17), where the ends of the bass reflex tube (21) and the gas exhaust tube (10) terminate, and that the radiation axis S intersects the center line M in space A between the two tubes (10, 21) or in tube (21), and the …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.