| http://www.w3.org/ns/prov#value | - The jitter means slight fluctuation and distortion of a signal, for example.For example, in some optical pickup devices, a jitter value included in a signal such as a reproduction signal is detected to adjust the operational center position of the objective lens (see, e.g., Japanese Patent Application Laid-Open Publication No. Hei7-262584 (pages 1 and 2, FIGS. 1 to 6)).In optical pickup devices, a
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