| 摘要 |
PROBLEM TO BE SOLVED: To provide a stable operation for an optical disk device which conducts PRML (Partial Response and Maximum Likelihood) processing by holding an equalization process and a viterbi decoding process when the repeating data to the sections such as a VFO (Variable Frequency Oscillator) section or the like are detected. SOLUTION: The optical disk device is provided with an equalizer 16 which equalizes reproduced signals from an optical pickup 11 on the basis of given error signals, a viterbi decoder 17 which conducts a viterbi decoding of the reproduced signals, an ideal signal generating circuit 18 which generates ideal signals in accordance with the decoded reproduced signals, an error signal computer 19 which computes error signals from the data string of the reproduced signals and the data string of the ideal signals and outputs the error signals to the equalizer, and a repeating pattern detector 20 which supplies stopping signals to the equalizer and the viterbi decoder or the like to hold the processes when a repeated pattern is detected in the reproduced signals from the decoder 17. Stable operations are realized by holding the processes in the repeated data of the sections such as the VFO section or the like.
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