| 摘要 |
PROBLEM TO BE SOLVED: To obtain a postprocessor circuit which is used in a sample data read channel of a large-capacity data storage device and is capable of medium noise error correction. SOLUTION: A Viterbi detector 34 receives an actual sampled partial response target signal from a storage medium of the large-capacity data storage device. A restored partial response target signal obtained from a restored data output signal and sampled partial response target data is filtered to generate a filtered output signal 51, and a threshold circuit presents a threshold with which this filtered output signal is compared, and a prescribed value 60 is added to the filtered output signal when a prescribed error event pattern caused by the medium noise or the like is generated in a restored data output signal 35. When the filtered output signal exceeds the threshold of the threshold circuit, this restored data output signal is changed.
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