摘要
窗函数法和频率采样法是两种较为典型的FIR数字滤波器设计方法。目前,相关的《数字信号处理》教科书对窗函数法设计FIR滤波器进行了较为详细的论述,但对用频率采样法设计FIR滤波器这部分内容讲解得不够细致,让初学的学生感到难以理解。针对用频率采样法设计FIR滤波器的相关问题进行了较为深入的探讨,并结合实例借助Matlab软件进行了仿真和验证。仿真结果表明,选择合适的过渡采样点和滤波器长度,可以有效地控制阻带衰减、过渡带宽及计算复杂度。
The window function and frequency sampling method are two typical methods for FIR digital filter design. At present, the ＂Digital Signal Processing＂ professional courses is only explaining the window function method in detail, but not explaining the frequency sampling method in detail. So the students have much difficulty to master it. The principle and some related questions of the frequency sampling method are discussed deeply. Matlab simulation software is used to analyze and test the design. Experiment results show that the stop-band attenuation and computation complexity for the frequency sampling method can be effectively controlled by proper selection of transition sampling point and filter width.
出处
《现代电子技术》
2010年第17期85-87,90,共4页
Modern Electronics Technique
基金
河南省教育厅自然科学研究指导计划项目(2008B510010)
关键词
FIR数字滤波器
频率采样法
过渡采样点
阻带衰减
FIR digital filter
frequency sampling method
transition sampling point
stop-band attenuation
