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METHOD AND RELATED APPARATUS FOR DERIVING A TRACKING ERROR SIGNAL

  • US 20040196755A1
  • Filed: 12/23/2003
  • Published: 10/07/2004
  • Est. Priority Date: 04/07/2003
  • Status: Active Grant
First Claim
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1. A method for deriving a tracking error signal based on a first analog detection signal and a second analog detection signal, the method comprising:

  • summing the first analog detection signal and the second analog detection signal to generate an analog sum signal;

    utilizing an analog delay device to delay the analog sum signal into a delay signal;

    digitalizing the delay signal into a digital delay signal;

    transforming the first analog detection signal and the second analog detection signal respectively into a first digital detection signal and a second digital detect signal; and

    respectively comparing the digital delay signal with the first digital detection signal and comparing the digital delay signal with the second digital detection signal to generate the tracking error signal.

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