由已知表达式画出原始波形和它的功率谱，并编制一个互相关函数程序，要求提取特定频率的成分，画出变换过程中的波形和功率谱。-Drawn from the known expression of the original waveform and its power spectrum, and the preparation of a cross-correlation function procedure that requires the extraction of specific freque

sac 地震分析处理软件，可实现地震数据的预处理、互相关、叠加等操作，可惜没有可视化界面-sac seismic analysis software, to achieve the pre-processing of the seismic data, cross-correlation, and stack, and unfortunately there is no visual interface