Secondly, the control of position loop was improved by using compound control with velocity and acceleration feed-forward control and digital notch filter control in feeding servo system.

其次对位置环的控制进行了改进，将位置前馈改进为速度前馈和加速度前馈，并在前向通路中增加了一个数字阶式滤波器组成复合运动控制器。

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However both the analog and digital notch filter removes the signal component when they eliminate the power line interference, so they are only used in simple biofeedback.

模拟陷波器和数字陷波器由于消除工频干扰的同时也去除了信号成分，一般只在简单生物反馈中使用。

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We analyze rejecting periodic interference in PD monitoring on line through cascade IIR digital wave notch filter. The principle and simple design method are proposed and discussed.

在分析用IIR陷波滤波器来抑制局部放电在线监测中周期性干扰的基础上，提出和论述了级联式II R陷波滤波器基本原理及简明设计方法。

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