Equalization system and method for equalizing a base-band telecommunication line
US5214670A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 12, 1991 |
| Grant date | May 25, 1993 |
| Priority date | — |
| Expiry date | Aug 12, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L25/03133
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Equalizer which includes a filter for compensating the frequency attenuation of the received signal transmitted by a Data circuit terminating equipment DCE through a base-band telecommunication line. The equalizer includes a detector determining the instants when the received signal is equal to a predetermined voltage reference value Vref and a timer for measuring the period DT separating two consecutive instants. The coefficients of the filters included in the equalizer are computed in accordance with the measured period DT. This provides an adaptive compensation of the distortion introduced by the telecommunication line without necessitating any training sequence. For this purpose, the equalizer further includes a comparator for comparing the measured DT value to a given DTref value. When the former is greater than the latter, the equalization process is increased by a factor depending on DTref, DTmax being the maximum measured value and DTmin corresponding to the minimum measured DT value. In the reverse case, the equalization process is decreased by another given factor depending on DTref and DTmin parameters.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.