| 摘要 |
<p>PURPOSE:To supply only an error signal having no noise to a capstan servo system by executing an A/D converting action only when an ATF (Automatic Track Finding) area is scanned and executing a D/A converting action when the area except the ATF area is scanned. CONSTITUTION:The titled device is provided with an arithmetic circuit 6 obtaining the difference in an output from first and second latch circuits 4 and 5 and supplying the difference in a pilot signal crosstalk level from both adjoining tracks to a converter, a capacitor 14 holding an error signal obtained by D/A converting from the converter, and an error signal equipped with a switch SW1 to change over an error signal from the converter and the error signal held at the capacitor 14 and supply to a capstan servo system and held at the capacitor 14 while the converter executes the A/D converting action is supplied to the capstan servo system. Thus, a digital signal processing can be executed with a simple circuit constitution and the supply of the noise to the capstan servo system can be prevented.</p> |
