Method and apparatus for telephone network impairment detection and compensation in signal transmission between modems
US6523233B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 22, 1999 |
| Grant date | Feb 25, 2003 |
| Priority date | — |
| Expiry date | Apr 22, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L1/242
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A general, low cost method for detecting and compensating any non-linear digital impairment and linear analog gain for data communication systems transmitting signals through telephone networks is disclosed. The inventive method eliminates the need of costly digital impairment tables any &mgr;-law encoders/decoders. Before each data transmission session, non-linear digital impairment and linear analog impairment is computed and then compensations for the digital and analog impairments are performed. Thereon, the actual data transmission begin. The digital impairment and analog impairment values must be computed for each data transmission session, but the values remain constant for the entirety of a session.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.