Phase-adjusted pre-emphasis and equalization for data communication
US7848402B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 29, 2005 |
| Grant date | Dec 7, 2010 |
| Priority date | — |
| Expiry date | Oct 14, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2025/03471
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Methods and circuits are provided for producing phase-adjusted pre-emphasis and equalization. In applications in which little or no phase distortion occurs during signal transmission, propagation, or reception, linear-phase pre-emphasis or equalization can be used to reduce or eliminate phase distortion introduced by the pre-emphasis or equalization. Linear phase, constant group delay FIR filters or circuits may have odd numbers of coefficients symmetrical about the middle coefficient. In applications in which signal phase distortion occurs, linear phase or non-linear phase pre-emphasis or equalization can be used to reduce or compensate for the phase distortion. Phase compensation may be effected using FIR pre-emphasis and equalization filters and circuits. Non-linear phase FIR filters may have different numbers and combinations of coefficients.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.