| 摘要 |
An information reproducing apparatus comprises an optical head that reads the lengths and arrangement of recording marks recorded on an optical disc and outputs RF signals, a PRML decoder that decodes binary data based on the RF signals output from the optical head, a short mark asymmetry measuring unit that measures an asymmetry in an RF signal of the RF signals output from the optical head that corresponds to a 2 T mark or shortest recording mark, and an RF signal offset unit that offsets the RF signals so as to remove the asymmetry in the RF signal corresponding to the 2 T mark based on the measurement by the short mark asymmetry measuring unit. The PRML decoder decodes the binary data based on the RF signals offset by the RF signal offset unit. The information reproducing apparatus can provide improved performance in reproduction of information recorded on an optical disc.
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