The servo systems compare the feedback signal with input instruction, then convert the difference into compensatory instruction so to control the output component.
伺服系统将检测信号和输入指令进行比较，将差值转化从而控制输出元件。
The output of this correction signal can be used to drive a simple auto-focus servo.
修正信号的输出可以用于驱动一个简单的自动聚焦伺服器。
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