摘要
通过比较几种不同的小波基函数的幅频特性,并利用不同的小波基函数对模拟地震记录进行时频分析,以期找到可以更为准确地描述地震信号时频特性的小波基函数。结果表明:利用dmey小波基函数可以更为准确地描述模拟地震信号的时频变化特征,因此,利用小波包变换对地震信号进行时频分析时选取dmey小波基函数较为合适。
Comparing amplitude-frequency characteristic of several different wavelet basis functions and carrying out time-frequency analysis of analog seismic record,we expect to find the wavelet basis function which exactly describes time-frequency characteristic of seismic signals while making time-frequency analysis with wavelet packet.Then,the result is that we can exactly describe time-frequency variation characteristics of analog seismic signals with wavelet basis function dmey.It means that wavelet basis function dmey is more appropriate for time-frequency analysis of earthquake signals using wavelet packet transform.
出处
《地震研究》
CSCD
北大核心
2010年第4期323-328,共6页
Journal of Seismological Research
基金
震情跟踪项目(2009A51)资助
关键词
小波基函数
时频分析
小波包
地震信号
wavelet basis function
time-frequency analysis
wavelet packet
earthquake signal
