Acoustic echo cancellation system
US8275142B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Mar 7, 2008 |
| Grant date | Sep 25, 2012 |
| Priority date | — |
| Expiry date | Jul 27, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M9/082
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An embodiment of an acoustic echo cancellation system is disclosed. The system comprises an echo cancellation unit, a second filter and a subtraction unit. The echo cancellation unit comprises a first attenuator, a first filter and a first subtractor. The first attenuator has a first down-scaling factor for attenuating a first signal. The first filter generates a first echo signal estimate based on the attenuated first signal. The first subtractor generates a third signal by subtracting the first echo signal estimate from a second signal. The second filter generates a second echo signal estimate based on the first signal. The subtraction unit subtracts the second echo signal estimate from the third signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.