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I_s
A_x
A_x =\bigcap_{r \in R_x}^{} N_x(r)
f(t)=c_0+\sum_{n=1}^{N}(c_ne^{jn\omega t}+c_{-n}e^{-jn\omega t})=\sum_{n=-\infty}^{\infty}c_ne^{jn\omega t}
c_0=\frac{a_0}{2}, c_n=\frac{a_n-jb_n}{2},c_{-n}=\frac{a_0+jb_n}{2}