| 摘要 |
<p>PURPOSE:To perform tracking control in order to make an edge part of a head coincide with a boundary of a formed track. CONSTITUTION:A signal V1 from a sample and hold circuit 55 is supplied to an A/D converter circuit 1, and a signal for turning on at the usual reproducing time is supplied to this converter circuit 1 from a terminal 2. A signal from this converter circuit 1 is supplied to a memory 3, and a signal from this memory 3 is supplied to a D/A converter circuit 4. A signal from this converter circuit 4 is supplied to a X2 circuit 5, and a signal from the X2 circuit 5 is supplied to a switch 6, and then a signal for turning on at the time of lower edge tracking is supplied to this switch 6 from a terminal 7. Then, a signal from this switch 6 is supplied to an adder 8 provided between a sample and hold circuit 56 and a differential circuit 69, and is added to a signal V2.</p> |
