Directional smoothing filter is frequently used in digital image processing for it has the double properties of noise filtering and edge preserving.

方向平滑滤波器兼有去噪和边缘保持的双重特性，在数字图像预处理中被经常采用。

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Digital PLL and digital filter are built based on conventional double closed-loop control which contains voltage loop and current loop.

前者在常规的采用电压外环、电流内环的双闭环控制基础上，搭建数字锁相环、数字滤波器。

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Digital PLL and digital filter are built based on conventional double closed-loop control which contains voltage loop and current loop.

前者在常规的采用电压外环、电流内环的双闭环控制基础上，搭建数字锁相环、数字滤波器。

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