Digital correlation method was used to extract phase information as the phase information of eddy current testing signals could reflect the characteristics of detecting system.

涡流检测信号中的相位信息能反映检测系统的某些特性，讨论用数字相关法提取相位特征信息。

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The article will contrapose maximum value method based on detecting image grey grad, and take example of SOBEL operator to realize digital image fringe picking up based on hardware (CPLD).

针对检测数字图像灰度梯度的最大值法，采用SOBEL边缘检测算子对数字图像进行边缘检测，并利用硬件(大规模可编程逻辑器件CPLD)实现了数字图像的边缘提取。

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The digital harmonic detecting method based on this kind of filter can be used in any kind of power harmonic compensation system.

基于此滤波器设计的数字谐波检测方法可用于任何一种电力系统的谐波补偿装置中。

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