Low frequency acoustic absorption and soft boundary effect with frequency-discretized active panels
US10991358B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Dec 31, 2019 |
| Grant date | Apr 27, 2021 |
| Priority date | — |
| Expiry date | Dec 31, 2039 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R2410/05
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
An active sound barrier has at least one passive sound absorber at or near a boundary location. A microphone provides an output to a frequency division module, in which a plural of frequencies are filtered to provide outputs corresponding to frequency segments of the receiving transducer output at respective ones of the frequencies. An active driving circuit drives plural speakers or output transducers at respective ones of the frequencies, with at least a subset of the speakers or output transducers at or close to the barrier. The speakers or output transducers cooperate with the passive sound absorber to reduce noise across a wide frequency band as well as to effect an electrically switchable soft boundary.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.