| 摘要 |
PURPOSE: A data-playing method of an optical disk is provided to remove noise affecting RF(Radio Frequency) signals. CONSTITUTION: An RF signal detected from a main spot(64) is delayed for a specific time and synchronized with a wobbling signal detected from a second sub-spot(62). If the main spot is delayed during a specific time, the main spot is positioned at a different phase wobbling region(24B) while the second sub-spot is at a same phase wobbling region(24A). When the main spot is positioned at the same phase wobbling region, the second sub-spot is at the different phase wobbling region. The same and different phase wobbling regions are arranged alternately in the width direction of a signal track. Thereby, the delayed main spot and the second sub-spot are positioned at the different wobbling regions all the time. The wobbling signal of the second sub-spot is subtracted from the RF signal of the main spot. Therefore, the noise mixed in the main spot is removed.
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