Pulse or digital communications – Repeaters – Testing
Patent
1988-10-14
1992-12-29
Kuntz, Curtis
Pulse or digital communications
Repeaters
Testing
375118, H03H 730
Patent
active
051757460
ABSTRACT:
This invention relates to a model apparatus equipped with an equalizer having a transversal filter and adapted so that equalizing characteristics can be set automatically at the time of data communication. A predetermined amount of received training data is stored in memory, the training data stored in intervals between receipt of the training data is read out of the memory, and tap gains of the transversal filter are computed and set in dependence upon the read data, thereby controlling the equalizing characteristics of the equalizer. A mirror image of a past jitter component from the equalizer output obtained before the present point in time is formed by folding over the jitter component at the present point in time. By using the mirror image as a prediction portion, an approaching jitter component is predicted and the equalizing characteristics of the equalizer are controlled so as to cancel out the predicted jitter component. Jitter component removal processing is started by such control. Further inverse characteristics of transmission line transmission characteristics for every communicating party on a connecting communication line are stored in memory upon correlating the inverse characteristics with the communicating parties. At communication with one of the parties, the inverse characteristics stored in correlation with this party are read out and the equalizing characteristics are controlled accordingly.
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Ichikawa Yuko
Inoue Yutaka
Yaguchi Tatsuya
Bocure Tesfaldet
Canon Kabushiki Kaisha
Kuntz Curtis
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