基于频域抽样的可变带宽滤波器设计  

Design of Variable-Bandwidth Filter Based on Sampling in Frequency Domain

作　　者：邹维[1] 达新宇[1] 谢铁城[1] 王舒[1] 

机构地区：[1]空军工程大学通信工程学院,西安710077

出　　处：《火力与指挥控制》2013年第10期138-140,共3页Fire Control & Command Control

基　　金：国家自然科学基金(60972042);研究生论文创新基金资助项目(2011004)

摘　　要：为了使数字滤波器能具有处理多种带宽信号的能力,在研究数字滤波器设计和现有可变滤波器结构的基础上,提出了一种基于频域抽样的可变带宽滤波器设计方法;通过利用现有的可变带宽滤波器结构,将可变带宽滤波器转移函数表示为多项因子与加权系数相乘,结合频域抽样设计滤波器的知识确定各个多项因子的加权系数。该方法由单一的截止频率来决定加权系数的大小,避免了复杂的矩阵运算,在电路的实现上用简单的开关电路就可以实现对加权系数的选取。仿真表明,该方法是一种有效的可变带宽滤波器设计方法。On the study of design of Digital Filter and existing variable filter,this paper puts forward a design of variable-bandwidth filter based on sampling in frequency domain to develop digital filter＇s ability to deal with bandwidth signals. By making use of the existing structure of variable- bandwidth filter, variable-bandwidth filter transfer function can be expressed in multiplication of multi- factor with Weighted Coefficient. In addition,it can confirm weighting coefficient of muhi-factors on the basis of design of filter on sampling in frequency domain.The pure cutoff frequency decides weighting coefficient. By this way, it not only avoid complex matrix operation, but realizes the use of simple switch circuits, naturally it realizes the choice of weighting coefficient. The simulation shows that this method is an effective design of variable-bandwidth filter.

关 键 词：可变带宽滤波器 频域抽样 线性相位 FIR滤波器 

分 类 号：TP311[自动化与计算机技术—计算机软件与理论]