Active noise control system and on-vehicle audio system
US10854187B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 11, 2019 |
| Grant date | Dec 1, 2020 |
| Priority date | — |
| Expiry date | Jul 11, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10K2210/3055
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
Audio (noise source) is output as a cancellation sound through a variable filter and a first filter, and transmitted to the second filter. A subtractor subtracts an output of a second filter from an output of a microphone, and an adaptive algorithm execution unit updates a transfer function of the variable filter so that the subtracted result becomes zero (0). A transfer function A for the first filter is a transfer function which can cancel noise at a position of a user's ear by setting, as the cancellation sound, a sound obtained by applying the transfer function A to audio at the time of learning, and a transfer function B for the second filter is a transfer function which can eliminate, for the cancellation sound, a difference between a sound obtained by applying the transfer function B to audio and the output of the microphone.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.