The method of bispectrum can extract characteristic of seismic series bispectrum and detect fracture zones by decreasing dimensions.
双谱法通过采用模式识别的方法对地震序列的双谱提取特征，通过降维实现裂缝发育带的检测。
The emphasis and difficulty lie in how to extract characteristic of signal efficiently, that is, the problem of seeking classification criteria.
其重点与难点在于如何有效的提取信号中的特征量，即分类标准的找寻问题。
The experimental results show that it is correct and feasible, and can extract characteristic information of the rotating speed spectral map effectively.
试验结果表明，变窗移傅里叶变换算法正确可行，可有效提取旋转机械振动信号转速谱阵的特征信息。
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