在DVD聚焦伺服系统中，光盘翘曲会导致产生与光盘转动频率相同的周期性扰动。

In DVD focus servo system, the skew of the disc induces periodic disturbance whose frequency is the same with the rotation frequency of the disc.

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为了提高DVD聚焦伺服系统的控制精度和响应速度需要加入控制器，提出了一种新的校正算法。

We need to add the controller in order to enhance the control precision and response speed of DVD focus servo system, and then a new emendation arithmetic was put forward.

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采用短波长激光光源是实现高密度光存储的一种有效途径，但是对聚焦伺服系统提出了更高的要求。

It is available to improve optical storage density by using short wavelength laser, but a harder focusing servo system is need.

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