基于MATLAB的FIR数字滤波器设计

摘要

文中针对传统FIR滤波器设计方法繁琐,设计步骤和过程繁杂,且设计好滤波器之后,不能直观快速修改滤波器参数来观察滤波器变化,设计了基于MATLAB的FIR数字滤波器.MATLAB功能强大,在进行有限脉冲响应滤波器(FIR)设计时,利用FDATool工具,根据不同需求,设计出不同的滤波功能.其能够快速处理目标函数,并将实时处理的结果曲线和目标函数进行理论对比,可以做到实时修改,使滤波器的设计更加方便、快捷、直观、节省时间.文中以FIR滤波器设计为例,对信号中噪声做出了处理,并用MATLAB进行了仿真,验证了理论的实现.%The for traditional FIR filter design method is tedious , complicated design steps and processes, and well designed filter cannot directly modify filter parameters to observe change filter, the design of the FIR digital filter based on MATLAB. MATLAB function is very powerful , in the finite impulse response filter (FIR) design, the use of FDATool tools, according to different needs, the design of different filtering functions. It can quickly deal with the objective function and theoretical comparison of the real-time processing of the curve and the objective function , can achieve real-time modification and enable the design of the filter is more convenient, fast and intuitive, save time. This paper takes the design of FIR filter as an example, and makes the processing of noise in the signal. The simulation is carried out with MATLAB, and the realization of the theory is verified.