Active sound attenuation device to be arranged inside a duct, particularly for the sound insulation of a ventilating and/or air conditioning system
US7248704B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Nov 4, 2002 |
| Grant date | Jul 24, 2007 |
| Priority date | — |
| Expiry date | Jan 22, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10K2210/509
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
The device for the active sound attenuation of a sound signal propagated in a duct comprises: at least first sensor means for a first sound signal, attenuation actuating means supplying an active sound attenuation signal in response to a selected control signal, an electronic control means generating the active sound attenuation signal for the actuating means. The first sensor means and the actuating means are arranged completely inside the duct opposite one another and at a selected distance from the casing of the duct, the axis of symmetry of the radiation of the actuating means and the axis of symmetry of the first sensor means are substantially parallel to the direction of propagation of the sound signal in the duct, and the actuating means are arranged upstream of the first sensor means in the direction of propagation of the sound signal in the duct.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.