Process and device for optimizing signal transmission rates on multifunctional well cables
US5243337A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 29, 1992 |
| Grant date | Sep 7, 1993 |
| Priority date | — |
| Expiry date | Apr 29, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L25/4917
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A process for optimizing the transmission rates of digitized signals on transmission lines in multifunction cables, such as logging cables linking well tools to surface installations. The process includes digitising of the data to be transmitted and coding thereof through voltages selected from a set of multilevel coding voltages (2 to 32 for example), and widening towards high frequencies of the passband of each transmission line used, by combination with correcting circuits selected so that the transfer function of the corrected line is substantially that of a filter of the Bessel type, at least in a given frequency range on either side of a 3-dB cut-off frequency fc which depends on the number of coding voltages and on the amplification parameters. Using this process makes it possible to exceed very easily a total flow rate higher than one Mbits/s without increasing the transmission error rate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.