| 摘要 |
PROBLEM TO BE SOLVED: To improve quality of a reproduced signal by reducing a non-linear characteristic of a reproduction signal.SOLUTION: A reproduction signal from an information recording medium is equalized (10), a binary signal (s4) is detected (12) from the equalized (10) equalization reproduction signal (s2) by Viterbi detection, asymmetry information (s11) indicating asymmetry of the equalization reproduction signal before Viterbi detection (12) is generated (14), while an equalization target value (s3) used when equalization (10) is performed is generated based on the asymmetry information (s11), and tap coefficient of equalization processing (11) is calculated (33) from the equalization target value (s3) and the equalization reproduction signal (s2). |
