| 摘要 |
PURPOSE:To improve the performance of servo control without preventing the mutual effects of servo control systems by selecting the speed servo control system to control requirement, in which speed servo is effective, and selecting the phase servo control system to control requirement, in which the phase servo control system is effective. CONSTITUTION:When a speed servo control system is chosen, both changeover switches SW1, SW2 are connected on the terminal (b) sides. When a servo lock signal is input from the comparator 13 of the speed servo control system and the speed servo control system is servo-locked, a recording mode or a regenerative mode is decided, and recording processing is executed as it is on the recording mode. Both change-over switches SW1, SW2 are connected to the terminal (a) sides in order to transfer to phase servo control on the regenerative mode. When a servo lock signal from the comparator 10 of a phase servo control system is output, regenerative processing is executed. |
