Patent ID: 7280455
Filing Date: 2007-10-09
Classification: G11B

Abstract:
1. A method for adjusting a recording condition of optical information, comprising the steps of: irradiating an optical recording medium with laser light having a recording pulse waveform generated based on a recording signal, which is in synchrony with clock cycles, to form a record mark group on said optical recording medium; reading said record mark group to obtain a reproduced waveform, and adjusting the recording condition by sampling said reproduced waveform at a period shorter than a clock period to evaluate a linearity of said reproduced waveform, wherein said adjusting step linearly interpolates sampled values of said sampled reproduced waveform at a timing of R 1 or R 2 assuming a maximum, to extract times-series data of said reproduced waveform for respective clock cycles, given R 1 and R 2 being expressed by the following formula: (i being an integer satisfying 0≦i≦m) respectively, wherein {a 0 , a 1 , . . . , a k , . . . , a n−1 , a n } represent said times-series data for respective said clock cycles of the clock for recording said optical recording medium, {y 0 , y 1 , . . . , y k , . . . , y n−1 , y n } represent time-series data of said reproducing waveform for respective said clock cycles (n being an integer not smaller than zero, and k being an integer satisfying 0≦k≦n), and {h 0 , h 1 , . . . , h m } represent pulse responses of a recording/reproducing system corresponding to a specific recording/reproducing condition (m being an integer satisfying 0≦m≦n).