| 摘要 |
After the learning step of an optical disc recording apparatus for writing a label side of an optical disc is accomplished, the focusing servo control signal includes an offset voltage component. Before or after the focusing servo control signal is converted into an analog output signal, the signal is processed by a low pass filter to remove a high-frequency portion so as to smoothen the signal, thereby removing the color or grey level gaps of the resulting pattern marked on the label side of the optical disc.
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