1.单位脉冲序列（单位采样序列）(sigma(n)={...,0,underline{1},0,...})
即
(sigma(n)=egin{cases}1, & n=0\0, & n eq 0 end{cases})
(asigma(n)=egin{cases}a, & n=0\0, & n eq 0 end{cases})
(sigma(n-k)=egin{cases}1, & n=k\0, & n eq k end{cases})
任意序列都可用单位脉冲序列的位移和加权和表示
2.单位阶跃序列(mu(n) = {...,0,underline{1},1,1,1...})
即
(sigma(n)=egin{cases}1, & n ge 0\0, & n < 0 end{cases})
3.矩形序列(R_N(n)={0,0,...underline{1},1,1...})
(R_N(n)=egin{cases}1,& 0le n le N-1\0 & else end{cases})
4.实指数序列(alpha^nmu(n))
5.复指数序列(e^{(sigma+j{omega}_{0})n})
(e^{(sigma+j{omega}_{0})n}=e^{sigma n}e^{jomega_0n})
(e^{sigma n})：实指数序列
(e^{jomega_0n})：虚指数序列
(e^{jomega_0n}=cosomega_0n+jsinomega_0n)
6.正弦序列(Asin(omega_0n+phi))
7.周期序列(x(n)=x(n+N))