Methods and devices for updating filter coefficients during echo cancellation
US9479650B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 5, 2015 |
| Grant date | Oct 25, 2016 |
| Priority date | — |
| Expiry date | Nov 5, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M1/2475
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Methods and devices for updating filter coefficients during echo cancellation are disclosed. A communication device includes a processor configured to operate a background filter configured as an adaptive filter, operate a foreground filter configured as a fixed filter; and update the foreground filter with coefficients from the background filter responsive to monitoring a history of both a near-end signal energy and an estimated far-end signal energy for a pre-determined time window in which conditions of each of the near-end signal energy and the estimated far-end signal energy are satisfied. A related method includes monitoring a near-end signal energy, monitoring an estimated far-end signal energy, performing an echo cancellation, and transferring coefficients from an adaptive filter to a fixed filter responsive to a history of both the near-end signal energy and the estimated far-end signal energy satisfying conditions for a pre-determined time window.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.