| 摘要 |
PROBLEM TO BE SOLVED: To provide an information reproducing device performing a Viterbi decoding method which generates state data expressing selected state transition and evaluates the quality or the like of a reproduced signal based on the state data. SOLUTION: An SMU (Status Memory Unit) 134 is used instead of a PMU (Pass Memory Unit) in a Viterbi decoder. The SMU 134 has four status memories 150, 151, 152 and 153 each having a state data value of a plurality of bits expressing the state as a processing unit and forms four status data as series of status data values by each status memory. A merge block 135 forms decoded data based on the four status data, detects disagreement between the four status data and forms a disagreement detection signal NM. The disagreements are counted based on the disagreement detection signal and quality of the decoded data or the reproduced signal is evaluated based on the counted value. COPYRIGHT: (C)2008,JPO&INPIT
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