数字滤波器的各种结构的C程序实现，包含格型滤波器。本文没有讨论复杂的数学方法及公式。相信对正在为滤波器结构实现烦恼的人有所帮助。-Various structures of digital filter C program, including lattice filter. This article does not discuss the complex mathematical methods and formulas. I believe the troubles are achieving for the filter structure of human help.