Reduced-complexity common-mode noise cancellation system for DSL
US8472533B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 2, 2011 |
| Grant date | Jun 25, 2013 |
| Priority date | — |
| Expiry date | Aug 4, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L5/00
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A noise cancellation system has a first transformer with an input side and an output side, the input side having first and second taps coupled to a signal provider, and a center tap providing a first common-mode voltage signal. A first digital subscriber line (xDSL) modem has an input coupled to the output side of the first transformer and an output coupled to customer premises equipment (CPE) for providing an xDSL signal to the CPE. A second transformer has an input side and an output side, the input side having first and second taps coupled to a signal provider, and a center tap providing a second common-mode voltage signal. A second xDSL modem is coupled to the output side of the second transformer. The difference between the first and second common-mode voltage signals is provided to at least one of the first and second xDSL modems to filter out noise from the xDSL signal provided by that modem.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.