| 摘要 |
According to one embodiment, it is possible to obtain a compensation SPP signal, which compensates a push-pull signal obtained by a ± first-order light or a lens shift compensation signal generated by other method according to phases of a motor to rotate a recording medium, from a MPP signal which is a component indicating the amount of de-tract in a reflected light from any one of recording layers of an optical disc detected by a photodetector, and it is possible to obtain a tracking signal with a high signal-to-noise ratio, by the following equation by using a compensation SPP signal and a MPP signal: <?in-line-formulae description="In-line Formulae" end="lead"?>MPP-compensation SPPxk<?in-line-formulae description="In-line Formulae" end="tail"?> where k is a constant.
|
