Echo removal
US9467571B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 28, 2013 |
| Grant date | Oct 11, 2016 |
| Priority date | — |
| Expiry date | Jan 17, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M9/082
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Echo removal techniques are described. An echo path of the echo in a received audio signal is modelled using a first model to determine a first model estimate of the echo. The first model estimate is used to determine a first performance value according to a performance metric. The first performance value is compared with a threshold value. It is determined if the echo path can be deemed linear based on the comparison. If so, the first model estimate of the echo is used to remove the echo in the received audio signal. Otherwise, the echo path of the echo is switched to be modelled using a second model to determine a second model estimate of the echo, and the second model estimate of the echo is used to remove the echo in the received audio signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.