| 摘要 |
A polarity switching signal generator able to stably generate a suitable polarity switching signal for inverting the polarity of a tracking error signal, wherein a reference value stored in a reference value storage circuit is updated by a rotational angle indicated by a rotational angle signal at a switching position of a land and groove captured by a capture circuit when an address decode signal is normal and wherein, further, a comparator compares the reference value stored in the reference value storage circuit with the rotational angle indicated by the rotational angle signal and generates a polarity switching signal instructing the switching of the polarity when they match.
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