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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This paper discusses an all digital phase-locked loop with a zero-crossing detector and a loop filter.

本文讨论的全数字锁相环包括过零检测器和环路滤波器。

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This PFC was realized by employing sliding-mode variable-structure inner current loop control and outer voltage loop PI control with digital low-pass filter to achieve high performance.

提出了采用滑模变结构电流内环与由PI调节器和数字低通滤波器组成的电压外环相结合的控制系统，以实现高性能高速度的功率因数校正。

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