| 摘要 |
PROBLEM TO BE SOLVED: To provide a reproduction signal processing apparatus capable of performing adaptive equalization control with stability not only in a channel rate mode but also in a half rate mode introduced to suppress power consumption when the waveform of large asymmetry or a waveform having distortion caused by a pit shape failure made during high speed recording. SOLUTION: A reproduction signal processing apparatus includes: a reproduction means 102, an A/D converter 103 for sampling a reproduction signal to obtain a multi-bit digital signal, a phase-locked loop control means 104 for outputting a reproduction clock that is in phase with clock components included in the reproduction signal from an oscillator, a frequency divider 105 for frequency-dividing the reproduction clock, an operation clock switching means 106 for selecting an operation clock, a filter 107 for performing digital equalization, a filter coefficient learning means 108 for adaptively controlling the filter coefficients to minimize an equalization error, and an equalization error correcting means 109 for performing correction so as not to output an abnormal equalization error. COPYRIGHT: (C)2005,JPO&NCIPI
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