| 摘要 |
Recorded data including secondary data independent of the main data, which are recorded on an optical disk being rotated in a constant linear velocity manner or a constant angular velocity manner by a variable clock signal or a clock-locked signal, are read out by computing an average of preamble data bits contained in the secondary data, setting a window value according to the average and detecting data bits following the preamble data, based on the window value, while rotating the disk in an arbitrary disk rotating manner without intervention of a phase-locked loop circuit.
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