Close tracking algorithm in a digital tracking servo system

Details Close tracking algorithm in a digital tracking servo system Close tracking algorithm in a digital tracking servo system

2005-05-24

2005-05-24

Hindi, Nabil (Department: 2655)

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

C369S044280, C369S044290, C369S047420

Reexamination Certificate

active

06898164

ABSTRACT:
A close tracking algorithm for a tracking servo system is disclosed. The track crossing rate of an optical pick-up unit positioned over an optical media is determined. When the track crossing rate is below a threshold value, then a tracking servo algorithm is enabled. The tracking servo algorithm provides control signals to control an actuator arm that controls the position of the optical pick-up unit over the tracks of the optical media. In some embodiments, the track crossing rate can be determined by monitoring the zero crossings of a tracking error signal derived from optical signals measured in the optical pick-up unit.

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