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Signal processing device capable of enhancing correctness of feedback signals

  • US 7,460,593 B2
  • Filed: 05/07/2004
  • Issued: 12/02/2008
  • Est. Priority Date: 10/14/2003
  • Status: Active Grant
First Claim
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1. A signal processing device for processing a received signal to generate a sliced signal, comprising:

  • an equalizer for generating an equalized signal according to the received signal;

    a multilevel quantizer, coupled to the equalizer, for utilizing X threshold/thresholds to quantize the equalized signal to thereby output the sliced signal being one of at least X+1 predetermined levels when a first mode is adopted, and utilizing Y thresholds to quantize the equalized signal to thereby output the sliced signal being one of at least Y+1 predetermined levels when a second mode is adopted, wherein the X and the Y are positive integers, the Y is more than the X, and the at least Y+1 predetermined levels are more than the at least X+1 predetermined levels; and

    a control logic for adopting one of the first mode and the second mode by executing the following steps;

    adopting the first mode and then comparing the equalized signal with the sliced signal which is the one of the at least X+1 predetermined levels for obtaining a first difference and comparing the equalized signal with a predetermined value which is different from any of the sliced signal and the X threshold/thresholds for obtaining a second difference;

    adopting the second mode instead of the first mode when the first difference and the second difference together indicate an unreliable status; and

    adopting the first mode when the first difference and the second difference together indicate a reliable status.

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