| 摘要 |
Disclosed herein is a data identification method for identifying, from within a readout signal from a recording medium on or in which user data of k bits are recorded using a recording modulation code wherein m bits from among n bits which compose one codeword have a value of "1" while the remaining n-m bits have another value of "0", the data, n and m being integers including, a first step of delimiting the readout signal in a unit of a codeword and adding, with regard to one of the n-bit codewords obtained by the delimiting, an amplitude of the readout signal of the bits of "1" to 2<img id="CUSTOM-CHARACTER-00001" he="3.13mm" wi="2.12mm" file="US20090009369A1-20090108-P00001.TIF" img-content="character" img-format="tif"/>k different codewords which may possibly be recorded and setting results of the addition as evaluation values, and a second step of finding a maximum value among the 2<img id="CUSTOM-CHARACTER-00002" he="3.13mm" wi="2.12mm" file="US20090009369A1-20090108-P00001.TIF" img-content="character" img-format="tif"/>k evaluation values and outputting the maximum value as an evaluation result.
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