Active noise cancellation of tonal noise by manipulating characteristic acoustic modes
US11664004B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 9, 2022 |
| Grant date | May 30, 2023 |
| Priority date | — |
| Expiry date | Nov 9, 2042 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10K2210/3055
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
To reduce engine noise in the cabin of an aircraft a plurality of error microphones is deployed at predetermined locations within the cabin to produce error microphone response signals associated with the engine noise in the cabin. Engine vibration inputs are obtained from sensors coupled to the aircraft engines. A processor is used to code the error microphone response signals into an encoded modal response in the cabin through a coding matrix. A processor is used to apply an adaptive filter to determine a plurality of modal signals needed to cancel the encoded modal response in the cabin. A processor is used to decode the modal signals into speaker input signals through a decoding matrix. Speaker input signals are then sent to a plurality of speakers to reduce the engine noise in the cabin.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.