Initial training apparatus for use in a transmitter and receiver apparatus
US5353305A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 14, 1990 |
| Grant date | Oct 4, 1994 |
| Priority date | — |
| Expiry date | Feb 14, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B3/235
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An initial gain of an automatic equalizer is fixed to a predetermined value. Then, the most appropriate gain of the automatic equalizer is determined when a training signal is received by the automatic equalizer. An echo replica signal produced by an echo canceler is multiplied by the value obtained by dividing the most appropriate gain by the initial gain. Thus, the echo replica signal is corrected to cancel the echo signal included in the output of the automatic equalizer. The sampling rate of the A/D converter used in the transmitter and receiver is shifted by a predetermined value from the transmission line rate at an initial training stage. Thereafter, the sampling rate of the A/D converter is determined to be near that of the transmission line.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.