Active noise cancellation (ANC) system with selectable sample rates
US10810990B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 30, 2019 |
| Grant date | Oct 20, 2020 |
| Priority date | — |
| Expiry date | May 4, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10K2210/3051
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
An active noise cancellation (ANC) system including a selectable decimation rate decimator that receives an oversampled digital input and has an input that selects the decimation rate, a filter that receives an output of the decimator, and a selectable interpolation rate interpolator that receives an output of the filter and has an input that selects the interpolation rate. The selectable decimation rate decimator and the selectable interpolation rate interpolator operate to provide a selectable sample rate for the filter based on the selected decimation and interpolation rates. The filter may be an anti-noise filter, feedback filter, and/or a filter that models an acoustic transfer function of the ANC system. Rate selection may be static, or dynamically controlled based on battery or ambient noise level. A ratio of the decimation rate and the interpolation rate is fixed independent of the dynamically controlled decimation and interpolation rates.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.