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Judgment level setting method and data receiver

  • US 20040013214A1
  • Filed: 04/04/2003
  • Published: 01/22/2004
  • Est. Priority Date: 10/05/2000
  • Status: Active Grant
First Claim
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1. (Amended) An evaluation level setting method to be employed in a data reception apparatus which receives a signal in which one or more bits of data is assigned as one data symbol to a signal level, comprising:

  • receiving an initialization pattern signal which is outputted from a data transmission apparatus, at turn-on of power or immediately after reset;

    establishing clock synchronization on the basis of the initialization pattern signal, and setting evaluation levels with which signal levels are subjected to threshold evaluation;

    calculating ideal values of the respective signal levels on the basis of the evaluation levels which are set according to the initialization pattern signal, and holding the ideal values; and

    adjusting the gain of a received signal on the basis of a difference between the signal level of the received signal and an ideal value of the signal level, thereby to correct variations in the received signal.

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