本设计要求学生以MATLAB作为设计工具，利用脉冲响应不变法或双线性变换法的一种或两种进行设计IIR数字低通滤波器，并利用MATLAB中的仿真工具进行系统仿真。将利用上述两种不同的方法设计的FIR滤波器的结果进行比较，分析各设计方法的特点及优缺点。-This design requirements with MATLAB design tools as students, applies impulse response not reform or double linear transform method of one or two of digital design IIR low-pass filter, and the use of MATLAB simulation tools for system simulation. Will use the above two different methods of FIR filter design comparing the result, analyzing the features and advantages and disadvantages of the design method.