| 摘要 |
With the objective of providing a stable PLL circuit and improving readout performance of an optical disk apparatus equipped with PRML, using the PLL circuit, phase detectors are respectively provided with respect to signals prior and subsequent to an FIR filter, and the phase detectors are selectively used according to an operating condition of a PLL to thereby stabilize the operation of the PLL circuit. There can be provided such an optical disk apparatus that readout performance is improved so as to extract an operating limit of a Viterbi decoder.
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