| 摘要 |
An automatic tracking system includes an analog/digital converter for converting an envelope signal detected by scanning a track during reproduction into a digitized envelope signal; a first track center detecting part for processing the entire track as a block and determining a track center value for the track using the digitized envelope signal; a part track center detecting part for dividing the track into a plurality of minute blocks, summing digital data of the digitized envelope signal corresponding to each of the minute blocks to produce sum data for each minute block, and determining a track center value for each minute block using the sum data for each minute block; and a final track center detecting part for determining a new track center value by using the track center values output from the first track center detecting circuit and the part track center detecting part.
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