Method and apparatus for preventing erroneous echoelimination and equalization
US5189637A · kind A · utility
8Cited by
9References
14Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 26, 1990 |
| Grant date | Feb 23, 1993 |
| Priority date | — |
| Expiry date | Mar 26, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B3/235
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
In a telecommunication system, erroneous echo-elimination and equalization resulting from non-linearities of a D/A-converter and an A/D-converter are prevented. An error signal (e.sub.n) updates an adaptive echo-elimination filter and an adaptive equalization filter. The error signal (e.sub.n) also adjusts the values of specific adjustable devices, such as capacitors, in the converters to compensate for non-linearities in the converters. The error signal is used by logic devices to adjust the converters in accordance with various algorithms.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.