Method and arrangement for echo cancellation of voice signals
US8538034B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 29, 2007 |
| Grant date | Sep 17, 2013 |
| Priority date | — |
| Expiry date | Jan 21, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M3/002
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A method and arrangement for cancelling echoes in a communication terminal (400) during a voice call with an opposite party. The communication terminal (400) comprises an echo cancelling unit (416,600) adapted to produce an estimate of echo information in received speech signals coming from a microphone in the communication terminal (400), and subtract the estimate from the received microphone signals, before being transmitted to the opposite party. The estimate is produced based on down-sampled received microphone signals and down-sampled received speech signals from the opposite party. The down-sampled speech signals from the opposite party are filtered in a digital filter (606), and the output signals from the filter (606) are up-sampled to form the estimate. Performing echo cancelling based on down-sampled speech signals from the opposite party and down-sampled microphone signals, requires a reduced amount of processing capacity of the communication terminal, still resulting in a sufficiently high quality echo cancellation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.