FIR 底通和带通滤波器和IIR 底通和带通滤波器，对于初学者具有参考意义，有详细的注释，信号维数的估计，一个很有用的程序，部分实现了追踪测速迭代松弛算法。- Bottom-pass and band-pass FIR and IIR filter bottom pass and band-pass filter, For beginners with a reference value, There are detailed notes, Signal dimension estimates, A very useful program, Partially achieved tracking speed iterative relaxation algorithm.