Adaptive equalizer
US4424498A · kind A · utility
4Cited by
2References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 27, 1981 |
| Grant date | Jan 3, 1984 |
| Priority date | — |
| Expiry date | Nov 27, 2001 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04Q1/56
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An adaptive equalizer for a twisted pair telephone line comprises a differential input/output amplifier, with the line connected to its positive input via a resistor and DC blocking capacitors. The junction of these capacitors is grounded via an adjustable impedance. The amplifier has a feedback loop with another adjustable impedance also connected to the negative input of the amplifier. Line impedance variations vary the impedance of both of the adjustable impedances, which, include diodes to separately compensate for the line's attenuation and frequency characteristics.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.