| 摘要 |
<p>IN WRITE POWER ADJUSTMENT FOR AN OPTICAL DISC HAVING A PLURALITY OF INFORMATION STORAGE LAYERS, DATA OF TRIAL WRITING IS VARIED BY THE INFLUENCE OF LAYERS OTHER THAN A TARGET LAYER. IT IS DIFFICULT, THEREFORE, TO DETERMINE OPTIMAL WRITE POWER. A MODULATION M[M] IS OBTAINED FROM A REPRODUCTION SIGNAL AMPLITUDE OF A SIGNAL SUBJECTED TO THE TRIAL WRITING PERFORMED WITH USE OF WRITE POWERS PW[M] (M BEING AN INTEGER) OF A PLURALITY OF KINDS. AT LEAST AN OPTIMUM WRITE POWER INTERCEPT PINT _OPT IS DETERMINED BY FITTING A RELATION BETWEEN THE PW[M] AND THE M[M] BY A MODULATION CHARACTERISTIC FORMULA M = MASY X (1-(PINT-PASY)/(PW-PASY)) HAVING AN ASYMPTOTIC MODULATION MASY, A WRITE POWER INTERCEPT PINT, AND AN ASYMPTOTIC WRITE POWER PASY AS PARAMETERS. APPROXIMATION ACCURACY BY THE FITTING AND/OR QUALITY OF THE TRIAL WRITING SIGNAL ARE EVALUATED WITH USE OF AT LEAST THE M[M], THE MODULATION CHARACTERISTIC FORMULA, AND THE PINT_OPT. AN OPTIMUM WRITE POWER PW _OPT IS CALCULATED BY PERFORMING A SPECIFIED OPERATION AT LEAST WITH USE OF THE PINT _OPT.</p> |
