（1）文档中描述了应用窗函数法和切比雪夫逼近法设计FIR滤波器的原理和过程，给出了相应的MATLAB程序。

（2）讨论了线性相位FIR滤波器的LATTICE结构实现方法，并给出了MATLAB程序-(1) document describes the application of window function method and Chebyshev design of FIR filters approximation theory and the process gives the corresponding MATLAB programs. (2) discussed the linear phase FIR filter realization method LATTICE structure and gives a MATLAB program