若要对产品中各组件在各种运作下的特性进一步了解，还会使用时频(Time-Frequency)的数值分析方法 (如FFT, HHT, enhance-Morlet Transfer..
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... 时频分析 [gap=1125]ords controllable recursive algorithm; parameter measure; sliding window FFT; time-frequency ...
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time-frequency modulation 时频调制
time frequency filtering 时间频率滤波
time frequency 时间频率
time frequency technology 时间频率技术
time-frequency-phase modulation 时频相调制
To compute time-frequency distribution is not the aim but just a preparation for further estimation.
2．计算信号的时频分布并不是最终的目的，而只是为信号的进一步分析进行准备。
参考来源 - 时频分析在雷达信号多参数估计中的应用研究The wavelet analysis is based on Fourier transform developed a time-frequency analysis method.
小波分析是在傅立叶变换的基础上发展起来的一种时频分析方法。
参考来源 - 小波分析与应用综述EMD is a self-adapt time-frequency analyzed method, and could grasp firmly signal’s characteristic information.
EMD方法是一种自适应的时频分析方法,可以更准确地把握信号的特征信息。
参考来源 - 滚动轴承内圈故障劣化状态辨识的研究·2,447,543篇论文数据，部分数据来源于NoteExpress
It can get not only high time-frequency resolution, but also parametric description of all kinds of data structures.
它不仅可以获得较好的时频分辨率，而且可以参数化描述任何类型的数据。
Wavelet is the best base of functions, with point singularity, and it has wide application in image processing because of its time-frequency localization and multiscale features.
小波是表示具有点奇异性函数的最优基，它由于具有时-频局部化特点和多尺度特性，在图像处理领域得到了广泛应用。
Therefore HHT was a kind of new time-frequency method for analyzing and processing the blasting vibration signals.
分析认为HHT是一种全新而更优越的分析与处理爆破震动信号的时频方法。
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