| 摘要 |
A digital modulation apparatus capable of generating a modulated code so that binary slice is correctly performed when reproducing is provided. To achieve this, in a digital modulation apparatus ( 10 A), a DSV change amount calculator ( 15 ) calculates change amounts (DeltaDSVa, DeltaDSVb) in DSVs of candidate modulated codes (CODEa, CODEb) generated by a modulated code generator ( 11 ). A modulated code determinator ( 13 ) compares the change amounts (DeltaDSVa, DeltaDSVb), and determines that the candidate modulated code having a smaller absolute value should be selected as a modulated code (CODE). A modulated code selector ( 14 ) selects one of the candidate modulated codes (CODEa, CODEb) which is determined by the modulated code determinator ( 13 ), and outputs the selected code as a modulated code (CODE) for source data (DATA).
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