Leakage-modeling adaptive noise canceling for earspeakers
US9142205B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 3, 2012 |
| Grant date | Sep 22, 2015 |
| Priority date | — |
| Expiry date | Dec 11, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10K2210/506
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A personal audio device, such as a headphone, includes an adaptive noise canceling (ANC) circuit that adaptively generates an anti-noise signal from a reference microphone signal that measures the ambient audio, and the anti-noise signal is combined with source audio to provide an output for a speaker. The anti-noise signal causes cancellation of ambient audio sounds that appear at the reference microphone. A processing circuit uses the reference microphone to generate the anti-noise signal, which can be generated by an adaptive filter. The processing circuit also models an acoustic leakage path from the transducer to the reference microphone and removes elements of the source audio appearing at the reference microphone signal due to the acoustic output of the speaker. Another adaptive filter can be used to model the acoustic leakage path.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.