| 摘要 |
The present invention is applied to an optical disk apparatus which records data on and/or plays back data from one of a variety of DVD optical disks. The present invention generates a binarization threshold S 3 by offsetting an envelope S 2 of a playback signal RF by an offset voltage V 1 , and binarizes the playback signal RF (S 4 ) according to the binarization threshold.
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