| 摘要 |
A digital filter (5) filters outputs of an A/D converter (3). An adder (10) adds outputs from the digital filter (5) and delayed outputs from a delay (9). An extracting circuit takes out driving data (11) from the added data. Error data, which are remaining data of the added data after extraction of the driving data by the extracting circuit (6) are delayed a predetermined period of time by a delay (9) and inputted to the adder (10). A driving unit (9) drives an optical system (2) according to the driving data (11). The error data (12) are fed back and added to outputs of the digital filter (5), thereby improving accuracy in driving of the optical disk system and, as a result, obtaining reliable controllability and high accuracy in positioning in the optical disk system.
|
