时频分析方法是利用小波变换原理，从地震波的时间域和频率域同时对其作出分析。
Time frequency analysis method is used to analyze the time domain and frequency domain of seismic waves at the same time according to the principle of wavelet transformation.
信号及其傅里叶变换可以分别反映信号在时频两域内的信息。
Signal and it's Fourier transform can reflect the info of time domain and frequence domain independently.
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