| 摘要 |
A reproduced signal 104 is sampled with a half-frequency clock signal to set two threshold levels 107, 108 for a sub-sampled data string 105, and the sub-sampled data string 105 is determined to be at three levels to produce an intermediate value data string 109. A modulo-2 operation is performed on the intermediate data string 109 to determine the data of the sub-sampled data string 105, and the data of a non-sampled data string 106 are decided with the state transition of the sub-sampled data string 105 to acquire reproduced data 112.
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