| 摘要 |
PURPOSE:To increase C/N and to widen the range of a recording power in the case of use of a pulse width modulation system for the modulation system of an optical disk of a recording system which records information by modulating the energy of light for irradiation between the intensities corresponding to optically identifiable two states or overwrites the fresh information on the old information. CONSTITUTION:The pulse width of the pulses on the high power side is set shorter than the pulse width of the information signal to be recorded. The more specific method includes a method of using the signal delayed in the rise of the pulse of the information signal to be recorded by a delaying circuit as the modulation signal for the energy of the light for irradiation or the signal which is obtd. by processing the information signal to be recorded by a low-pass filter and is further binarizing this signal by a binarization circuit as the modulation signal for the energy of the light for irradiation, etc. |
