| 摘要 |
<p>When recording data according to the PWM recording system by modulating signals, pulse modulation for pulse modulation for recording for recording a 0 signal or the like having a signal width of nT (T: Clock time) after modulation is a continuous electro-magnetic wave at a power level e, a record signal pulse array for recording a 1 signal or the like having a signal width of nT after modulation comprises a pulse section fp having a time width x and a power level a, a multi-pulse section mp in which a low level pulse at a power level b and a high power pulse at a power level c having a time width T in total alternately appear (n-n') times in all with a duty ratio y, and a pulse section op having a time width z and a power level d, and x, y, z are integers satisfying the conditions of 0.5T ≦ x ≦ 2T, 0.4 ≦ y ≦ 0.6 and 0.5T ≦ z ≦ 1T, and n' is a positive integer which is equal to or smaller than n, and controls are provided so that the condition of (a and c) > e > (b and d) is satisfied.</p> |
