Optical drive tracking control method
OwnerChian-Shiung Wanginventor
Life of this patent
Estimating the term…
Abstract
An optical drive tracking control method allowing an optical drive to select a first tracking error detecting method or a second tracking error detecting method to generate tracking error signals when reading a CD is provided. First of all, a CD is read and the first tracking error detecting method is used to generate a first tracking error signal. Next, determine if the first tracking error signal is correct or not: if yes, continue to use the first tracking error detecting method, otherwise, change to the second tracking error detecting method. Of which, the first tracking error detecting method can be the three-beam method or the differential push pull method (DPP method), while the second tracking error detecting method can be the differential phase detection method (DPD method).
Claims12
An optical drive tracking control method for an optical drive to read a compact disc (CD) wherein this method comprises the steps of:
- reading the CD and using a three-beam method to generate a first tracking error signal;
- determining if the first tracking error signal is correct or not;
- and
- continuing to use the three-beam method if the first tracking error signal is correct, and changing to use a differential phase detection method (DPD method) if the first tracking error signal is incorrect.
An optical drive tracking control method used for an optical drive to read a compact disc (CD), wherein this method comprises the steps of:
- reading the CD and using a differential push pull method (DPP method) to generate a first tracking error signal;
- determining if the first tracking error signal is correct or not;
- and
- continuing to use the DPP method if the first tracking error signal is correct, and changing to use a DPD method if the first tracking error signal is incorrect.
An optical drive tracking control method used for an optical drive to read a compact disc (CD) wherein this method comprises the steps of:
- reading the CD and using a first tracking error detecting method to generate a first tracking error signal;
- determining if the first tracking error signal is correct or not;
- and
- continuing to use the first tracking error detecting method if the first tracking error signal is correct, and changing to use a second tracking error detecting method if the first tracking error signal is incorrect.
Dependencies are inferred from the claim text.