...获得K类局部特征集合，由此将蛋白质结 构抽象成K维欧氏空间的特征点，并求得发生K 类局部特征的频率（local feature frequency， LFF）。
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local frequency feature 局部频率特征
In the view of feature signal extraction, the local wave time-frequency analysis and information entropy were used to deal with fault diagnosis.
从特征信号提取的角度出发，采用局域波时频分析和信息熵结合的方法进行往复式压缩机故障诊断。
The concept of local energy in time-frequency plane, based on local wave theory, is defined. Then a new feature extraction method based on the local energy in time-frequency plane is given.
在局域波理论的基础上，引入了时频局部能量的概念，进而提出了一种基于时频局部能量的特征提取方法。
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