| 摘要 |
A normal resolution component included in a readout signal of a super resolution optical disc is canceled to improve quality of the readout signal. The normal resolution component is separated from the readout signal of the super resolution optical disc by using a normal resolution selection filter such as a low pass filter, a mark length determination circuit, and then the normal resolution component is subtracted from an original readout signal while gain and a phase are appropriately controlled. Thereby, an influence of crosstalk due to the normal resolution component is reduced.
|
