Multi-channel echo cancellation method and apparatus
US5856970A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 5, 1996 |
| Grant date | Jan 5, 1999 |
| Priority date | — |
| Expiry date | Aug 5, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H21/0012
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An echo canceller (500) utilizes a central control unit (502) (CCU) and at least one convolution processing unit (504) (CPU) to perform echo cancellation on one or more channels. A method for operating the echo canceller (500) controls reading (706) one or more reference signals (510) and reflected signals (512), convolution and adaptive processing (11, 21, 31, 41) using the CPUs (504), and post-processing (702) to produce one or more echo cancelled signals (514). Convolution and adaptive processing for multiple channels can be performed simultaneously (11, 31) by multiple CPUs (504), or in a time-multiplexed manner (11, 21) by a single CPU (504), or a combination (11, 21, 31, 41) of simultaneous and time-multiplexing by multiple CPUs (504). CCU (502) is able to perform processing functions (702-730) while CPUs (504) perform convolution and adaptive processing (11, 21, 31, 41).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.