The principles of frequency mixing technique and its application to detect PD signals at ultra high frequency (UHF) are introduced in this paper.

介绍了混频技术的原理及其在超高频局部放电信号提取中的应用。

youdao

Therefore, taking advantage of AD device and digital filtering technique to realize mixing and other frequency transformation function is a comparatively advanced, novel and practical method.

因此，采用AD器件和数字滤波器技术实现混频等频率变换功能，是一种比较先进和新颖并且实际可行的方法。

youdao