目 录
3.1 Filter Design & Analysis Tool对多频带FIR滤波器进行设计… 8
3.2.2 窗函数法设计带来的误差分析及常见的窗函数… 10
3.2.1 频率抽样法设计多频带FIR滤波器设计思想… 18
在数字控制系统中输入信号中所含的干扰对系统的心能会产生很大的影响，因此需要对输入信号进行处理，以提取有用信号。本设计指出了传统的数字滤波器设计方法过程复杂、计算工作量大、滤波特性调整困难的不足，提出了一种基于MATLAB软件的数字滤波器设计方法。
文中深入分析了该滤波器系统设计的功能特点、实现原理以及技术关键，阐述了使用MATLAB进行多频带FIR滤波器设计及仿真的具体方法。采用MATLAB软件对多频带FIR滤波器仿真设计，简化了设计中繁琐的计算。本文采用MATLAB工具箱，窗函数，频域采样的方法进行了多频带FIR滤波器设计，并绘制对应的幅频特性曲线。
关键词：多频带,FIR滤波器, MATLAB,窗函数,频域采样
In digital control system, which is mixed in the input signal, has a great effect on performance of the system .Therefore, processing of input signal has to be done to get useful signal .This design points out that the traditional design method of digital filter is not only complex but also of heavy workload, even adjustment of filtering parameter is very difficult. So it brings forward another design method of digital filter which based on the MATLAB software.
It deeply analyzes the design features and principles of the filter system and the key technical in the design. Then it describes the use of MATLAB in design and simulation of the multi-band FIR filter design .designing the multi-band FIR filter by MATLAB can simplify the complicated computation in simulation. By using the methods of MATLAB tool, window function, frequency sampling, the design of multi-band FIR filter has been processed and the amplitude-frequency characterization has been given.
Keywords: multi-band, FIR filter, MATLBA, window function frequency sampling
