Active noise control system comprising auxiliary filter selection based on object position
US11335314B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | May 21, 2020 |
| Grant date | May 17, 2022 |
| Priority date | — |
| Expiry date | May 21, 2040 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10K2210/3221
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
Adaptive filters output a cancellation sound from a speaker, a selector selects outputs of a plurality of auxiliary filters each corresponding to different positions, a subtractor subtracts the selected output from the output of the microphone and outputs the subtracted output to the adaptive filter as an error signal, and a position detection device detects a position of a head of a user. A transfer function estimated so that the error signal becomes 0 when noise is canceled at the corresponding position is preset in the auxiliary filter. When the auxiliary filter corresponding to the position close to the head of the user changes, the switching control unit stepwise increases the frequency with which the output of the auxiliary filter is selected by the selector to 100%.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.