Echo canceller with variable step-size control
US12039989B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 21, 2021 |
| Grant date | Jul 16, 2024 |
| Priority date | — |
| Expiry date | Sep 21, 2042 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R2400/01
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
An acoustic echo canceller (AEC) uses a simulated echo from an adaptive filter to cancel an actual echo from a real environment. The echo cancellation is optimal when the adaptive filter response accurately matches the environment response. This can be achieved by changing coefficients of the filter in a step-wise fashion until the filter is converged on a configuration that provides optimal results. The convergence of the filter can be negatively affected by interference due to a double talk event or by an event in which the environment is changed. The disclosed AEC is configured to respond to these disruptive events by adjusting a step-size of the adaptive algorithm used to change the coefficients.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.