Controlling attenuation during echo suppression
US7065207B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 11, 2003 |
| Grant date | Jun 20, 2006 |
| Priority date | — |
| Expiry date | Jun 30, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M9/082
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An echo canceling system receives and transmits audio signals between a far end and a near end. During single talk, which is when only one end is originating audio, the path back to the originator is impeded by echo cancellation and attenuation. When there is double talk, which is when both ends are originating audio, the attenuation is removed, or at least significantly reduced. This is achieved by using ERLE, which itself is a known signal used for other purposes in an echo cancellation system, to provide information as to when double talking is occurring. This allows for stopping the attenuation for the double talk situation, which is the desired result.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.