Patent ID: 8174947
Filing Date: 2012-05-08
Classification: G11B

Abstract:
1. An evaluation apparatus, comprising: a signal reading block configured to read a recorded signal from an optical recording medium through light irradiation thereto, the signal having been recorded by formation of pits on the medium; a first waveform equalization block configured to input a reproduced signal obtained by said signal reading block reading said recorded signal, so as to perform a waveform equalization process on said reproduced signal using equalization characteristics that vary the signal level of a reproduced waveform of a short pit of said reproduced signal intensively; a boundary detection block configured to detect a boundary between a waveform of pits and a waveform of lands from said reproduced signal; a selective output block configured selectively to output one of two signals based on a result of boundary detection performed by said boundary detection block, one of the two signals being said reproduced signal having undergone said waveform equalization process performed by said first waveform equalization block, the other signal being said reproduced signal not undergoing said waveform equalization process by said first waveform equalization block; and an evaluation value generation block configured to generate an evaluation value denoting a distribution of signal edge positions based on said reproduced signal having undergone said waveform equalization process output by said selective output block.