| 摘要 |
A reproducing device performs error correction, detects a medium defect at an early stage and performs erasure correction. A reproducing device having an error correction circuit is provided with a medium defect detector. The medium defect detector computes a moving average value of the reproducing signal, slices this moving average value with a threshold Th, and detects a defect. A continuous amplitude drop can be detected accurately compared with a simple threshold detection, and deterioration of error correction capability due to a detection error can be suppressed. Also a defect can be detected in a previous stage of the error correction decoding, so a defect can be detected at an early stage, and erasure can be corrected at an early stage during error correction.
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