| 摘要 |
A semiconductor integrated circuit of this invention includes a synchronous detection circuit which is given a playback signal generated by reading both first data recorded before recording to an optical disk is interrupted and second data recorded after the interruption, detects synchronization of the playback signal, and outputs a playback sync signal, and a sync signal phase measurement unit which is given the playback signal and playback sync signal, and measures and outputs a phase difference between those components corresponding to the first and second data, which are contained in the playback sync signal.
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