| 摘要 |
PROBLEM TO BE SOLVED: To provide an information detector with a digital PLL circuit having a wide margin the loop delay of which is short and following secular change, and an optical disk device. SOLUTION: Information is detected by A/D converting a reproduction signal by a clock with frequency higher than that of a channel clock, digitally equalizing A/D conversion output by the same clock, performing re-sampling from digital equalization output by the PLL circuit applying an interpolation circuit, re-sampling the A/D conversion output by a second interpolation circuit after delaying it by the same quantity as that of a digital equalizer, using information about the PLL circuit for an interpolating position of the second interpolation circuit, a tentative tap coefficient is generated by inputting interpolation information before and after equalization in a tap coefficient controller, feeding back the tentative tap coefficient by converting it into operation rate of the digital equalizer by a rate collecting circuit, inputting interpolation output of equalizer output in a binarization circuit.
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