| 摘要 |
<p>PURPOSE:To attain an optimum tracking control for making the error generating amount minimum. CONSTITUTION:The error of reproduced data is detected by an error detecting circuit 16 from the output of a correction circuit 14, and the error generating amount is calculated by an error calculating part 17 from the output of the error detecting circuit 16. The generated error amounts at the previous time and present time are compared by a comparator 18, and based on the comparison result, the offset of a reference potential of an ATF error signal is adjusted by a control signal generating circuit 19. Thus, a tracking phase to make the error generating amount minimum is automatically obtained.</p> |
