| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical disk device capable of rapidly and accurately extracting peak values for every code length in a playback signal in which a plurality of code lengths are mixed. SOLUTION: The optical disk device playing back an optical disk in which data are recorded by the plurality of code lengths by using a PRML (Partial Response Maximum Likelihood) system includes an AD conversion part converting the playback signal of the optical disk into a multivalued digital signal, a waveform equalizing part equalizing the waveform of the multivalued digital signal based on a prescribed partial response to form an equalization playback signal, a decoding part forming decoded data corresponding to data recorded in the optical disk from the equalization playback signal and a peak value extracting part extracting the peak values for every code length from the equalization playback signal based on the decoded data and the description of the prescribed partial response. COPYRIGHT: (C)2009,JPO&INPIT
|
