Automatic Equalizer
US5432794A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 30, 1994 |
| Grant date | Jul 11, 1995 |
| Priority date | — |
| Expiry date | Jun 30, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L25/03038
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
An adaptive type automatic equalizer is provided with a mean square error detection circuit including a square circuit 119 for squaring the absolute value of an equalization error, and a low-pass filter 120. A comparator 102 compares the detection value of the detection circuit with a predetermined threshold value .lambda.. When the detection value is larger than the threshold value, the type of the adaptive type automatic equalizer is switched from normal equalization to blind equalization. Even when the adaptive type automatic equalizer diverges, it can be controlled to converge again. When a level change amount detector 101 for detecting a level change amount received from a line at an input point detects a level change exceeding a predetermined level, a timer A 119 measures the duration time of the level change. When the measured duration exceeds a predetermined period of time, the timer switches a switch 124 to shift an equalization mode from normal equalization to blind equalization. The blind equalization processing time is measured by a timer B 120. When the blind equalization processing time reaches a predetermined period of time, the switch 124 is switched again to shift …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.