| 摘要 |
PROBLEM TO BE SOLVED: To minimize the probability that servo information is misdetected by inputting phase-difference divided bit streams generated by dividing a sampled bit stream by an analog-digital converting circuit and detecting addresses according to the individual input divided bit streams. SOLUTION: The signal converted by an A/D converter(ADC) 526 is inputted to a track number/position signal detecting circuit 517, whose detection signal is further inputted to a position control circuit 522 performing position control, and a voice coil motor(VCM) 523 is driven to control the positioning of a head 512. The 4-fold oversampling signal from the ADC 526 is inputted sequentially to an address detector of a track number/position signal detecting circuit 517, one by one, to discard a 4th sample and then the next and succeeding samples are inputted to the address detector in order.
|
