Ambient noise-based adaptation of secondary path adaptive response in noise-canceling personal audio devices
US9208771B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 25, 2013 |
| Grant date | Dec 8, 2015 |
| Priority date | — |
| Expiry date | May 1, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10K2210/3028
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
An adaptive noise canceller adapts a secondary path modeling response using ambient noise, rather than using another noise source or source audio as a training source. Anti-noise generated from a reference microphone signal using a first adaptive filter is used as the training signal for training the secondary path response. Ambient noise at the error microphone is removed from an error microphone signal, so that only anti-noise remains. A primary path modeling adaptive filter is used to modify the reference microphone signal to generate a source of ambient noise that is correlated with the ambient noise present at the error microphone, which is then subtracted from the error microphone signal to generate the error signal. The primary path modeling adaptive filter is previously adapted by minimizing components of the error microphone signal appearing in an output of the primary path adaptive filter while the anti-noise signal is muted.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.