| US 7,613,983 B2 | ||
| Error correction device of optical disk unit | ||
| Katsutoshi Moriyama, Yokohama (Japan); Yusuke Ikeda, Chigasaki (Japan); and Tomoyuki Maekawa, Fujisawa (Japan) | ||
| Assigned to Kabushiki Kaisha Toshiba, Tokyo (Japan) | ||
| Filed on Jun. 23, 2006, as Appl. No. 11/473,180. | ||
| Claims priority of application No. 2005-184842 (JP), filed on Jun. 24, 2005; and application No. 2006-161034 (JP), filed on Jun. 09, 2006. | ||
| Prior Publication US 2007/0011582 A1, Jan. 11, 2007 | ||
| Int. Cl. H03M 13/00 (2006.01) | ||
| U.S. Cl. 714—769 | 20 Claims |
| 9. An error correction device of an optical disk reproduction unit for reproducing recorded information from an optical disk
recorded with a first code row data added with an error code in the same direction as a sequence of recorded information in
a recording portion of the optical disk and with recorded guide information recorded in advance in an inerasable state before
said first code row is recorded as a recorded guide for recording said first code row data in said optical disk, comprising:
a first position detection portion configured to detect a physical configurational singular point in said recorded guide information
as a first position;
a second position generating portion configured to generate a second position replacing said first position detected by said
first position detection portion with said first code row data position;
an error detection portion configured to detect a data error of said second position; and
an error measurement portion configured to measure the number of errors detected by said error detection portion,
wherein, when the number of errors measured for a predetermined period by said error measurement portion satisfies a predetermined
value, errors of said first code row data are erasure-corrected by using said second position.
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