The picture elements across a line are converted to the video signal and low-pass filtered with an electrical filter .
沿着一条直线的图象象素被转换成视频信号，然后由一个电子滤波器进行低通滤波。
To provide intelligent instruments with the cheap interface of the standard current sign, the RC low pass filter is used for producing a voltage signal which is proportion to PWM's duty rate from PWM.
为了给智能仪表提供廉价标准电流信号输出接口，可以使用RC低通滤波器，从PWM中分离出与占空比成正比的线性直流电压信号。
A repetitive controller can be obtained by designing a zero phase shift low pass filter. With the help of digital signal processing and software tools, it is easy to design a satisfactory controller.
该方法将控制器的设计转化为零相移低通数字滤波器的设计问题，借助于数字信号处理的理论和工具直接得到所需的控制器参数。
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