Then, based on defining three conceptions called as the second order spectrum, two theorems about the second order spectrum were proven.
然后，以定义三个叫做二阶谱的概念为基础，证明了两个关于二阶谱的定理。
Classification by using frequency spectrum of three-order principal component is put forward.
提出了利用缺陷的三阶主分量频谱来分类。
The ultrasonic echoes of welding flaws for three types of pressure vessel are analyzed for feature extraction of signal processing using higher-order spectrum method.
针对焊接缺陷超声检测中信号处理的特征提取问题，应用高阶谱方法对三类压力容器焊接缺陷的超声回波信号进行了分析。
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