Bridge-tap equalizer method and apparatus
US5517523A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 16, 1993 |
| Grant date | May 14, 1996 |
| Priority date | — |
| Expiry date | Jun 16, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03G5/025
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An equalizer (100) is suitable for removing the delay distortion from a switched digital signal received from a telephone channel, where the delay distortion is caused by a bridge-tap connected to the telephone channel. The equalizer includes a feedback delay circuit (200) which is arranged to delay the output signal (150) by an amount of time based on the square of the predominant frequency of the output signal. The resulting delayed feedback signal (130) is then combined with the input signal, thereby compensating for the delay distortion. The equalizer also includes an amplifier (103) which may be adjusted to compensate for the attenuation distortion caused by the bridge-tap.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.