利用谐波分析及Blackman窗设计FIR滤波器性能的改进  

On the Use of Harmonic Analysis for Improving Performance of FIR Filters Designed Based on Blackman Window

作　　者：宋依青[1] 王允龙[2] 

机构地区：[1]常州工学院计算机信息工程学院,江苏常州213002 [2]淮阴工学院电子信息工程系,江苏淮安223001

出　　处：《常州工学院学报》2009年第5期31-36,共6页Journal of Changzhou Institute of Technology

摘　　要：介绍了基于谐波分析改进利用Blackman窗设计FIR滤波器性能的计算过程,给出了设计步骤,总结了滤波器阶数计算等式。通过仿真实验,把其结果与用Blackman窗函数设计的滤波器的性能进行了比较,在滤波器阶数相同的条件下,在不同频率范围内,该方法比用Black-man窗设计的滤波器的阻带衰减大5~7dB以上,不仅过渡带宽依然变小,而且二者的通带波纹大小相差很小。实验证明,该方法可以显著提高用Blackman窗及其他窗函数所设计的滤波器的性能。This paper introduces calculating process for improving features of FIR filters designed by Blackman window based on the harmonic analysis, and then formulates designing steps, thus the formula for computing the order of filters is derived. A comparison is made between the performance of harmonic analy- sis method and that of Blackrnan window method through the simulated experiments, and in the condition of same order of filters, the stop-band attenuation of filters designed by this method is 5 -7 dB more than that of filters designed with Blackman window in the range of different frequencies. The transition bandwidth gets still smaller, and the difference between their pass band ripples is very small. The experimental results have demonstrated that the method proposed in this paper can obviously improve performances of filters designed by using Blackman window and other windows.

关 键 词：FIR滤波器 窗函数 谐波分析 

分 类 号：TN911.72[电子电信—通信与信息系统]