基于窗函数法的FIR数字滤波器设计  

Design of FIR digital filter based on window function method

作　　者：屈召贵 Qu Zhaogui(School of Information Engineering,Sichuan Tourism College,Chengdu 610100,China)

机构地区：[1]四川旅游学院信息与工程学院

出　　处：《信息技术与网络安全》2019年第9期85-89,共5页Information Technology and Network Security

基　　金：四川省教育厅重点科研项目(自然科学)(16ZA0424)

摘　　要：数字滤波器是用来对离散信号的数字代码进行运算处理,以达到改变信号频谱的目的,在通信、图形图像、语音、声纳、生物、地震等信息处理中广泛应用。因此在数字信号处理课程教学中,数字滤波器的设计显得尤为重要。在工程实践中有限长脉冲响应数字滤波器(FIR)更为普遍,以此在教学中提出根据理想频响,采用直接逼近的实验设计方法,并通过MATLAB具体实现。从理论、视觉和听觉三方面设计实验内容。结果表明该方法能较好地让学生运用傅里叶变换等相关理论知识解决实际问题。Digital filters are used to process the digital codes of discrete signals in order to change the spectrum of signals.The design of digital filter is very important in the course of digital signal processing because it is widely used in the fields of communication,graphics,speech,sonar,biology,earthquake and so on.In engineering practice,finite length impulse response digital filter (FIR) is more common.Based on this,an experimental design method of direct approximation based on ideal frequency response is proposed in teaching and realized by MATLAB.The experimental contents are designed from three aspects:theory,vision and hearing.The results show that this method can make students use Fourier transform to solve practical problems.

关 键 词：数字滤波器 傅里叶变换 单位脉冲响应 

分 类 号：TN919.5[电子电信—通信与信息系统]