Line equalizer
US4500999A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 24, 1982 |
| Grant date | Feb 19, 1985 |
| Priority date | — |
| Expiry date | Nov 24, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B3/145
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A line equalizer including a .sqroot.f equalizer for compensating a .sqroot.f-characteristic of a transmission line, a BT equalizer connected in series with the .sqroot.f equalizer for removing an echo component caused by a bridged tap (namely, BT) on the transmission line, and a circuit for controlling the .sqroot.f equalizer is disclosed. A signal applied to the .sqroot.f equalizer is subjected to over-equalization to make the time domain length of impulse response at the output of the .sqroot.f equalizer small. The equalization state of the output of the .sqroot.f equalizer is judged by signals formed in the BT equalizer, and the gain of the .sqroot.f equalizer is controlled on the basis of the result of judgement. In this manner, the .sqroot.f equalizer is controlled without suffering any interference between a control loop of the .sqroot.f equalizer and a control loop of the BT equalizer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.