PURPOSE:To generate correct digital data by detecting that the part to violate a prescribed modulating rule or a normal characteristic held by a reproducing signal occurs and correcting it based upon respective remaining extracted components. CONSTITUTION:When equalizing data (a) are outputted from an equalizing circuit 20, peak position detecting data (b) and (c) are outputted from OR circuits 24 and 35 and comparing data (d) are outputted from a level comparing circuit 34. Data (b), (c) and (d) are inputted to input edges D1-D3 of a latch circuit 36, respective data are extracted by the rise of a clock (e) outputted from a PLL circuit 29 and data (f)-(h) are outputted from output ends Q1-Q3. A control circuit 37 detects the part, etc., to violate the modulating rule of the data (f) and the normal characteristic of the equalizing data. By executing the correcting processing to the data (f) based upon data (g) and (h), correct digital data can be obtained.
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