Method and apparatus for controlling record and reproduction...

Details Method and apparatus for controlling record and reproduction... Method and apparatus for controlling record and reproduction...

2009-03-02

2011-11-08

Young, Wayne (Department: 2627)

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

C369S044340, C369S044260

Reexamination Certificate

active

08054723

ABSTRACT:
Disclosed is a method and apparatus for controlling the record and reproduction of optical record medium in which plural nonrecord regions having different phase are arranged between recordable data regions for the distinction in the shape of the data region. The method and apparatus performs the servo using focus error signal and tracking error signal averaged by the low pass filter at the header region of the optical disc. Especially, the tracking servo is performed by holding a fixed DC off-set value at the header region existing on the L/G switching or holding the tracking error value of the previous same track region. As a result, the exact header region is detected, the track sliding phenomenon is removed, and the tracking servo is stabilized, resulting in preventing the degeneration of the record and reproduction characteristics.

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