REPRODUCTION SIGNAL EVALUATION METHOD, REPRODUCTION SIGNAL EVALUATION UNIT, AND OPTICAL DISK DEVICE ADOPTING THE SAME

摘要

A reproduction signal evaluation unit has: a pattern detection section (101) for extracting, from a binary signal, a specific state transition pattern which has a possibility of causing a bit error; a differential metric computing section (102) for computing a differential metric based on the binary signal of the extracted state transition pattern; an error computing section (116) for computing an error rate predicted based on an integration value that is integrated by an integration section (125), a count value that is counted by a pattern count section (124), an integration value that is integrated by another integration section (105), and a count value that is counted by another pattern count section (104), and a standard deviation computing section (120) for computing a standard deviation based on the computed error rate.