Automatic polarity adaptation for ambient noise cancellation
US8571226B2 · kind B2 · utility
3Cited by
3References
7Claims
0Family size
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Key dates
| Filing date | Dec 10, 2010 |
| Grant date | Oct 29, 2013 |
| Priority date | — |
| Expiry date | Dec 29, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10K2210/3016
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A sound reproducing device has a loudspeaker arranged to produce sound from an audio signal provided by an audio signal source. A microphone is positioned to pick up ambient noise and generate a microphone signal which comprises the noise. An ambient noise cancellation (ANC) system receives the microphone signal from the microphone and generates anti-noise corresponding to the ambient noise in the microphone signal. An automatic polarity adaptation (AAP) system monitors the ANC system and, when a decision criterion is fulfilled, causes a switch in polarity for the generated anti-noise.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.