| 摘要 |
A series of alternating pits and lands: a pit of 3T in pit length, a land of *6T in land length, a pit of 7T in pit length, a land of 3T in land length, a pit of 6T in pit length, and a land of 7T in land length, are provided in a read-in region (27) of an inner peripheral region of an optical disk (10). These pits and lands are used as a test pattern for evaluating the read-in error of the optical disk (10). The error rate is detected by reproducing this test pattern data by a reproduction system and correction coefficients for minimizing this error rate is determined. The reproduction signals are corrected by utilizing this correction coefficients. Therefore, the reproduction signals can be reproduced by the reproduction system at minimum error rate.
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