| 摘要 |
The data selector 59 provides the recording signal Data 1 as LD recording signal LD Data 1 and the output control signal Data 3' as LD recording signal LD Data 3, and fixes the LD recording signal LD Data 2 to H level. The S&H select circuit 58 supplies an inverted one of the NRZI signal to the enable terminal of the sample and hold circuit 53. The sample and hold circuit 53 samples an output of the bias power 1 part and supplies it as LD control signal LDC 2 to the APC circuit 55. Thus, the bias power 1 being a light power of the multi-pulse is sampled by the sample and hold circuit 53 and controlled by the APC circuit 55 as will be discussed later.
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