| 摘要 |
PURPOSE:To improve the C/N and to improve the recording density by executing the recording, based on a clock signal having a larger period than that of a bit clock signal. CONSTITUTION:A bit clock signal is applied to a frequency converting circuit 11, a converted to as to become a larger period, and becomes a clock signal. An original signal applied to a shift register 10 is delayed by a prescribed time and applied as a delay signal to an input terminal of an AND circuit 13. The original signal, the delay signal, a clock signal and a frequency-divided clock signal applied to the input terminal of the AND circuit 13 pass through this AND circuit 13, and become recording signals. Also, the recording signal applied to a NOT circuit 14 is inverted and outputted, inputted to a differential amplifier 15 of the next stage, brought to differential amplification, and applied to a driver of a laser. In such a way, the C/N characteristic is improved, and the recording density can be improved. |
