Active sound reduction apparatus and active noise insulation wall having same
US7613307B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 6, 2006 |
| Grant date | Nov 3, 2009 |
| Priority date | — |
| Expiry date | Nov 8, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10K11/17881
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An active noise insulation wall includes an active sound reduction apparatus disposed on an upper end surface of a noise insulation wall. The active sound reduction apparatus comprises a combination of an active acoustic control cell and a sound tube. The active acoustic control cell controls a coming noise such that a diffracted sound pressure component of the coming noise at the upper end surface of the noise insulation wall is actively reduced. The sound tube decreases a sound wave of a frequency different from a target frequency of the active acoustic control cell. Thus, the active noise insulation wall can effectively reduce noises including many frequency components.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.