| US 7,394,740 B2 | ||
| Reproduction signal evaluation method | ||
| Chosaku Noda, Kawasaki (Japan); Yutaka Kashihara, Fuchu (Japan); Yutaka Okamoto, Chofu (Japan); Hideo Ando, Hino (Japan); and Koichi Hirayama, Ichikawa (Japan) | ||
| Assigned to Kabushiki Kaisha Toshiba, Kawasaki-shi (Japan) | ||
| Filed on Jul. 27, 2006, as Appl. No. 11/493,799. | ||
| Application 11/493799 is a division of application No. 10/899140, filed on Jul. 27, 2004, granted, now 7,106,677. | ||
| Application 10/899140 is a division of application No. 09/826907, filed on Apr. 06, 2001, granted, now 6,785,210. | ||
| Claims priority of application No. 2000-106639 (JP), filed on Apr. 07, 2000. | ||
| Prior Publication US 2006/0262689 A1, Nov. 23, 2006 | ||
| This patent is subject to a terminal disclaimer. | ||
| Int. Cl. G11B 7/00 (2006.01) | ||
| U.S. Cl. 369—53.22 [369/124.12; 369/59.17] | 3 Claims |
| 1. A reproduction signal evaluation method comprising:
a first step of playing an information recording medium on which digital information is recorded with record marks having
various sizes by using optical means, and obtaining a reproduction signal reflecting the digital information;
a second step of obtaining a first reproduction signal, of signals contained in the reproduction signal, which reflects digital
information recorded with a record mark having a largest size, on condition that the digital information is recorded by RLL
(1, n) modulation;
a third step of obtaining a second reproduction signal, of signals contained in the reproduction signal, which reflects digital
information recorded with a record mark having a predetermined size other than a record mark having a smallest size, on condition
that the digital information is recorded by the RLL (1, n) modulation;
a fourth step of obtaining an evaluation value on the basis of the first and second reproduction signals; and
a fifth step of evaluating a characteristic of the reproduction signal on the basis of the evaluation value.
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