基于MATLAB的FIR数字滤波器设计与仿真

Designing and simulating FIR digital filter based on MATLAB

数字滤波器是数字信号处理中的重要组成部分.数字滤波器分为有限脉冲响应数字滤波器(FIR)和无限脉冲响应数字滤波器(IIR).介绍了利用窗函数设计FIR滤波器的方法,即根据给定的滤波器技术指标,确定有限长单位脉冲序列,通过选择滤波器的长度和窗函数,使其具有最窄宽度的主瓣和最小的旁瓣.并举例用MATLAB进行实现和仿真,指出基于Matlab环境下进行数字滤波器的设计简便易行.

Digital filter is one of the most important parts of digital signal processing, and it is widely used in many fields of information technology. Digital filter can be classified into the Finite Impulse Response Digital Filter (FIR) and the Infinite Impulse Response Digital Filter (IIR). This paper presents a method of using the windows function to design FIR digital filter. The finite length unit pulse series can be assured according to filter technical indexes, to make sure the filter has the most narrow width main lobe and the smallest side lobe. The paper gives an example to achieve and simulate it with MATLAB, and points out that the method to design digital filter based on Matlab is simple.