用矩形窗设计一个FIR线性相位低通数字滤波器-Design a FIR linear-phase low-pass digital filter with a rectangular window

用频率采样法设计一个线性相位低通滤波器的源程序，可以仿真出系统函数-Using frequency sampling method to design a linear phase low-pass filter of the source, can simulate the system function

分别使用矩形窗和汉明窗函数设计一个线性相位FIR低通滤波器，使其逼近理想低通滤波器的频率特性。采用频率抽样法设计FIR数字低通滤波器滤波器。-Using rectangular window and hamming window function to design a linear phase FIR low-pass filter, the frequency characteristics of the ideal low-pass filter. Frequency sampling m