| 摘要 |
<p>PROBLEM TO BE SOLVED: To regulate the tracking appropriately regardless of the operating mode by a constitution wherein a switch circuit selects an integration signal depending on the operating mode. SOLUTION: The level difference signal between pilot signals f1 and f2 is integrated through integration circuits 30a, 30b having different time constant. A switch circuit 32 selects the integration signal from integration circuit 30a in after-recording mode and insert mode while selects the integration signal from integration circuit 30b in normal playback mode. Subsequently, the integration signals are subjected to sample & hold through a sample hold circuit 34 which produces an AT error signal.</p> |
