But now the field is finite that wavelet analyses is used in the ultrasonic testing signal processing, and the problem of selecting the best wavelet didn’t be considered in the application of wavelet.
但目前小波分析处理超声检测信号的应用领域还很有限，并且应用过程中没有考虑最优小波基的选取问题。
参考来源 - 小波变换在航空构件超声检测信号分析与处理中的应用研究·2,447,543篇论文数据，部分数据来源于NoteExpress
The new arithmetic constructed the best wavelet packet based on the wavelet library with the criterion of fusing energy cost function and contract the most valuable features of the signals.
新算法以融合能量代价函数为标准，在整个小波库中构造最优小波包基，从小波包基上提取信号最有价值的特征值。
Firstly, the best wavelet basis selection was conducted via message entropy function; then the gas load was decomposed to low frequency signal and high frequency signal by two times through it.
首先用信息熵函数最小选择最优小波基，然后用其对燃气负荷进行二层分解得到负荷的低频信号和高频信号。
Wavelet analysis, as a time frequency analysis tool, has been widely used in many fields of electric power system. To select and construct the best wavelet for user is of important significance.
小波分析作为时频分析工具已经越来越广泛地应用于电力系统的各个领域，如何选择和构造最适合用户需要的小波具有重要意义。
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