Wavelet analysis is a new technique in time and frequency analysis domain recent years. It is the inheritance and development of Fourier analysis, but it has much advancement than Fourier in essence.
小波分析是近些年在时频分析领域迅速发展起来的一种新技术,它是一种思想,也是一种算法,目前正在被越来越多的应用于计算机领域,小波的应用研究催生了一批科技成果并有许多已经转化为了生产力。
参考来源 - 基于小波变换的脑电去噪方法研究与实现·2,447,543篇论文数据，部分数据来源于NoteExpress
Joint time Frequency Analysis (JTFA) describes and determines how the frequencies of non stationary signals change over time. It offers a better understanding of nature of the signal.
时-频联合信号分析法能描述非稳态信号的频率如何随时间而变化，故它能使我们更好地理解信号的本质。
The processing result notes that the method of time frequency analysis may improve stability and liability of extracting Rayleigh wave velocity.
处理结果表明，应用时频分析方法可以提高瑞雷波速提取的稳定性和可靠性。
Then the time domain analysis methods and frequency domain analysis methods which are frequently used for fault diagnosis have been discussed.
其次论述了常用的故障诊断方法，即时域分析方法和频域分析方法。
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