| 摘要 |
A data recording and reproducing system is provided that adds a first error correcting code to input data to generate a first code block, encodes the first code block with a second error correcting code to generate a second code block, interleaves the second code block to generate a recording block, and records and reproduces the recording block via a partial response channel including a recording medium. This system includes an iterative decoder that iteratively decodes an output signal from the partial response channel, and thus decodes the second code block; a preliminary decision and reliability detection unit that preliminarily determines decoded data and determines reliability of the decoded data, based on likelihood information obtained in the middle of iterative decoding in the iterative decoder; and a first error correcting code decoder that decodes the first error correcting code. In this system, the preliminary decision and reliability detection unit supplies the decoded data preliminarily determined and the reliability information of the decoded data to the first error correcting code decoder.
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