Echo canceller employing H-register and storage register
US7408891B2 · kind B2 · utility
6Cited by
18References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 28, 2003 |
| Grant date | Aug 5, 2008 |
| Priority date | — |
| Expiry date | Jul 4, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B3/23
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An echo canceller comprising a digital filter having adaptive coefficients which are updated to simulate an echo response, a temporary register for storing default coefficients, and a controller for monitoring ERLE and in the event the ERLE is greater than a first predetermined threshold then enabling the digital filter and replacing the default coefficients in the temporary register with the adaptive coefficients, and in the event the ERLE is less than a second predetermined threshold then disabling the digital filter and replacing the adaptive coefficients with said the default coefficients from the temporary register.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.