OPTICAL DISK RECORDING AND REPRODUCING DEVICE AND OPTICAL DISK RECORDING AND REPRODUCING METHOD

摘要

A recording and reproducing unit (11) alternately repeats a recording operation of converting recording data to recording pulses (WP) on the basis of recording parameters and forming a recording area on an optical disk (10) on the basis of the recording pulses (WP) and a reproducing operation of generating an analog reproduction signal (AS) on the basis of the recording area formed on the optical disk (10) by the recording operation. A reproduction processing unit (12) converts the analog reproduction signal (AS) to a digital reproduction signal (DS). A decoding processing unit (13) subjects the digital reproduction signal (DS) to a maximum-likelihood decoding process to generate a binary signal (D302). A quality information detection unit (14) detects a reliability value for each edge pattern of the binary signal (D302). A control unit (15) adjusts the recording parameter on the basis of the reliability value detected for each edge pattern.