Systems and methods for adaptive noise cancellation by biasing anti-noise level
US9460701B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 16, 2013 |
| Grant date | Oct 4, 2016 |
| Priority date | — |
| Expiry date | Oct 24, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10K2210/30351
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A processing circuit may comprise an adaptive filter having a response generating an anti-noise signal from a reference microphone signal, a secondary path estimate filter modeling an electro-acoustic path of a source audio signal, a biasing portion that generates a scaled anti-noise signal by applying a scaling factor and the response of the secondary path estimate filter to the anti-noise signal, and a coefficient control block that shapes the response of the adaptive filter in conformity with the reference microphone signal and a modified playback corrected error signal by adapting the response of the adaptive filter to minimize ambient audio sounds in the error microphone signal, wherein the playback corrected error is based on a difference between the error microphone signal and the source audio signal and the modified playback corrected error signal is based on a difference between the playback corrected error signal and the scaled anti-noise signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.