Hybrid active silencer
US4665549A · kind A · utility
80Cited by
8References
23Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 18, 1985 |
| Grant date | May 12, 1987 |
| Priority date | — |
| Expiry date | Dec 18, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10K2210/509
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
Acoustic attenuation apparatus (2) is provided for a duct (4) guiding an acoustic wave propagating (6) therethrough. A silencer (8) is provided for passively attenuating the acoustic wave in the duct, and a cancelling speaker (32) is provided within the silencer. The combination provides hybrid active/passive combined attenuation. Various rectangular and circular structures are disclosed, together with multi-path and multi-speaker arrangements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.