| 摘要 |
<p>PURPOSE:To improve delay in a tracking reacting operation, by controlling the phases of a control signal and a comparing reference signal which performs a phase comparison, in a tracking control device, such as a VTR, etc. CONSTITUTION:A tracking control device 30 outputs a control signal CTL to a phase comparator 11 through a waveform arranging circuit 23. A tracking counter circuit 31 counts a clock signal CK receiving a synchronizing signal VD, and when a count value arrives at a prescribed count value regulated by a control signal SC1, a pulse signal S11 delayed from the signal VD for a prescribed time is outputted to a mode counter 32. The circuit 32 outputs a comparing reference signal DVD delayed from the signal S11 for the prescribed time based on a control signal SC2, to the phase comparator 11. A CPU34 reads out a data stored at a memory 35 corresponding to the operation of a key operator 33, and outputs the signals SC1 and SC2. The comparator 11 outputs a phase comparison signal S5 without generating a time delay, and thereby, the delay in the tracking reacting operation can be improved.</p> |
