| 摘要 |
A method of recording multivalued information by writing, by using a photo spot, an information pit on a virtual cell that is set on a track of an optical information recording medium, while changing a width of the information pit in the direction of the track, and of reproducing the multivalued information by detecting a level of the multistep reproduced signal from the information pit, includes: recording different pieces of multivalued information in a learning area of the optical information recording medium on a unit cell (predetermined number of cells) basis; sampling the reproduced signals of the multivalued information on the unit cell basis by using the photo spot; storing the reproduced signals in the sampled learning area on the unit cell basis; recording the multivalued information in a user data area of the optical information recording medium; sampling, by using the photo spots, the reproduced signals from the multivalued information recorded on the user data area; and reproducing the multivalued information in the user data area by comparing the reproducing signal of the learning area and the reproduced signal of the user data area.
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