Heusristics for optimum beta factor and filter order determination in echo canceler systems
US6687373B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 24, 1999 |
| Grant date | Feb 3, 2004 |
| Priority date | — |
| Expiry date | Aug 24, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B3/23
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A method, apparatus and system employing such for adapting the Beta factor in a echo cancellation adaptive filter by using echo loss return enhancement (ERLE) as a metric to determine the setting of the Beta factor. In addition, a method and apparatus for determining the optimum number of filter taps used in an adaptive filter by dividing a filter array into blocks of taps, finding for each tap the sum of squares of the coefficients therein and then comparing the sum to an average block energy. Based on this comparison, a block is deemed to either contribute significantly to the operation of the filter or not. Starting with the tail end block of the array, the optimum filter order is found by determining when the first contributing block is found.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.