QianchengKao

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Hi wang when you are using ![](http://latex.codecogs.com/svg.latex?hl(w)=1/(1-e^{jw\tau}) ), how to deal with the case that ![](http://latex.codecogs.com/svg.latex?f\rightarrow0 )? and ![](http://latex.codecogs.com/svg.latex?hl(w)\rightarrow\infty)?