有限冲击响应数字滤波器的基础理论。

　　FIR数字滤波器是一种非递归系统，其冲激响应h(n)是有限长序列,其差分方程表达式为：



N为FIR滤波器的阶数。-Finite impulse response digital filter of the basic theory. FIR digital filter is a non-recursive system, its impulse response h (n) is a finite sequence, the difference equation is expressed as: N is the order of FIR filter.