基于短时傅里叶变换的岩石声波信号分析方法研究

针对岩石声波信号离散、非平稳,含有较多突变分量等特性,提出一种基于短时傅里叶变换的时频分析方法。通过合理选择窗函数、加窗长度以及窗移动步长,对岩石声波信号进行时频分析,提取相关声学参数。结果表明:短时傅里叶时频分析能很好地显示信号时域和频域局部特征,能够清楚地描述声学参数（频率、振幅等）变化。

Study on Method Analyzing Acoustic Signal of Rock Based on Short-time Fourier Transform

Considering the acoustic signal of rock, discrete, non-stationary, and multiple fault component included, a time-frequency analysis method based on short-time Fourier transform was proposed, which studies the acoustic signal of rock by reasonably selecting widow function, windowing length and window moving stride in order to extract the related acoustic parameters. The result shows that, the short-time Fourier time-frequency analysis may present the local features of time and frequency domain well, and demonstrate the variation of acoustic parameters (such as frequency, amplitude) clearly.