Data discussion of the EMD method in the practice
Shuqing Guo · Signal Processing · 2010
In this paper,a new nonlinear non-steady method for signal treatment is introduced in detail,which is valid and predominant.It is used to analysed the seismic wave.The EMD method and its process are presented through a great amount of data study.A range of good-shift of data is given from a lot of data analysis and the rule is given.When the frequency of combined sine wave is constant,the value of A2/A1 is very small,and it is over a limit;or the value of A2/A1 is large,and it is over a limit,EMD method is not applicable.When amplitude ratio of sine wave A2/A1 is constant,but the frequency varies,if the value of f2/f1 is very small,and it is over a limit;or the value of f2 is very close to f1,and the ratio f2/f1 is over a limit,the value of y is not able to be shifted by EMD method.