Active noise control system
US11922916B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 8, 2022 |
| Grant date | Mar 5, 2024 |
| Priority date | — |
| Expiry date | Jul 16, 2042 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R2499/13
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A signal e(z) obtained by subtracting echo-canceling sound from an output of a second microphone is used as an error of an echo cancellation adaptive filter and a noise cancellation adaptive filter, and an output of a first sound source device is added to the signal e(z) and output from a first speaker. The echo cancellation adaptive filter generates echo-canceling sound from an addition signal of the output of the second sound source device and the output of the first microphone such that the signal e(z) is minimized. The noise cancellation adaptive filter generates the noise-canceling sound from the output of the first sound source device such that the signal e(z) is minimized, and outputs the noise-canceling sound from the second speaker.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.