Patent ID: 7200094
Filing Date: 2007-04-03
Classification: G11B,H03M

Abstract:
1. A reproduced signal evaluation apparatus for evaluating a signal reproduced from a recording medium, comprising: a binary data detecting means for decoding said signal reproduced from said recording medium by maximum likelihood decoding; a SAM value computing means for computing a SAM value in real time based on a result of detection by said binary data detecting means, wherein SAM means Sequenced Amplitude Margin; and a reproduced signal evaluation means for evaluating said reproduced signal based on said SAM value computed by said SAM value computing means, wherein said recording medium comprises an optical recording medium or an magneto-optical recording medium from which recorded data is reproduced by an optical means; and wherein a quality of said reproduced signal, that is obtained when data recorded on said recording medium under a recording optical output power and reproduced under a different reproducing optical output power, is evaluated by said reproduced signal evaluation means using said SAM value computed by said SAM value computing means and, based on a result of said evaluation, an optimal reproducing optical output power is determined for reproducing data recorded on said recording medium.