野外采集的地震信号是多种波的复合体，是一种时变的非平稳信号。
The seismic signal acquired in the field is a complex of different waves and a time variant non stationary signal.
针对三缸往复泵测量信号非平稳时变特点，研究了用小波消噪方法提取反映往复泵动力端状态的振动波形特征。
With a view to time_varying characteristic of the vibration signal measured on triplex reciprocating pump, an approach on the waveform feature extraction which reflects th...
主要内容包括：1、以时-频分析作为分析时变非平稳信号的有力工具，清楚地为我们描述了信号频率随时间变化的关系。
The main contents are as follows:1. As a powerful tool to analyze the non-stationary signals, the time-frequency analysis shows us clearly frequency varies with time.
时频分析作为分析时变非平稳信号的有力工具，成为现代信号处理研究的一个热点。
Now, Time-Frequency Analysis is one of the top interests in Signal Processing, and more and more research has been put on this topic.
该文提出了一种新的非平稳信号的时变参数ARMA模型分析方法，用它分析数据需两个基本步骤：首先，用一种信号分解方法把信号分解成一些基本模式分量。
In this paper, a new method for time-varying ARM A model is introduced. It includes two procedures. First, using one method of signal decomposition, a signal is decomposed into some basic components;
该文提出了一种新的非平稳信号的时变参数ARMA模型分析方法，用它分析数据需两个基本步骤：首先，用一种信号分解方法把信号分解成一些基本模式分量。
In this paper, a new method for time-varying ARM A model is introduced. It includes two procedures. First, using one method of signal decomposition, a signal is decomposed into some basic components;
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