| 摘要 |
PROBLEM TO BE SOLVED: To provide a signal correction method capable of accurately correcting a wobble signal without introducing the upsizing and the increase of the cost. SOLUTION: In the wobble signal Sa consisting of a specified carrier wave part and a phase modulation wave part wherein the carrier wave is phase modulated, an amplitude of the carrier wave part and an amplitude of the phase modulation wave part are individually adjusted. In this case, by means of adjusting (signal Sb, signal Sc) so that the amplitudes of the carrier wave part and phase modulation wave part become respectively an amplitude of the time hardly influenced by the crosstalk, the acquisition of the wobble signal (signal Sd) is attained, of which the influence of the crosstalk is accurately corrected simpler than heretofore and also in a short period of time. COPYRIGHT: (C)2005,JPO&NCIPI
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