The design and realization processes of digital notch filter, low -pass filter and mean filter are presented, and their characteristics are analyzed and compared.

为保证系统的稳态控制效果，最终选用均值滤波器，并指出其动态特性的不足需要其它控制方法予以弥补。

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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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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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