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Differential phase detection device and tracking error signal detection apparatus using the same

  • US 6,977,982 B2
  • Filed: 11/13/2001
  • Issued: 12/20/2005
  • Est. Priority Date: 12/26/2000
  • Status: Expired due to Fees
First Claim
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1. A differential phase detection device detecting a differential phase signal from first through fourth signals, the differential phase detection device comprising:

  • a slicer slicing and digitizing each of the first through fourth signals with respect to a reference level;

    a first synthesizer synthesizing the first digitized signal and the third digitized signal to generate a first synthesis signal;

    a second synthesizer synthesizing the second digitized signal and the fourth digitized signal to generate a second synthesis signal;

    a phase difference detector comparing a phase of the first synthesis signal with a phase of the second synthesis signal to generate a first phase difference signal and a second phase difference signal; and

    a matrix circuit determining a difference between the first and second phase difference signals received from the phase difference detector to output the differential phase signal.

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