移动电视直放站中CIC滤波器的性能改进方法  

Performance Improvement of CIC Filter in Mobile TV Repeater

作　　者：华永平[1] 刘楠[1] 王书旺[1] 顾斌[1] 

机构地区：[1]南京信息职业技术学院电子信息学院,江苏南京210046

出　　处：《电视技术》2010年第4期36-39,共4页Video Engineering

摘　　要：分析了级联积分梳状(CIC)滤波器的结构,证明其可以高效地胜任抽取滤波的任务。但CIC滤波器也有缺陷,如通带下垂严重,信号折叠带衰减不充分。旋转辛克修正法和凯塞汉明补偿法联合使用于CIC滤波器的改进技术中,有效地弥补了CIC滤波器的缺陷。以混叠噪声功率最小化为准则建立优化模型,供移动电视领域数字滤波器设计人员参考。The structure of Cascaded Integrator Comb （CIC） filter is discussed. CIC filter can efficiently perform the task of both decimating and filtering. But CIC filter also has disadvantages, such as serious droop in the passband and insufficient attennuation in the folding band. Rotated Sinc （RS） correcting method and Kaiser-Hamming compensating method are jointly applied to the improvement of CIC filter, and the disadvantages of CIC filter can be effectively remedied. An optimization model is built under the criterion of minimal aliasing power leading to an optimal solution scheme, which can be a reference to the designers of digital filters in the field of mobile TV.

关 键 词：移动电视 直放站 混叠 抽取 CIC滤波器 旋转辛克修正法 凯塞汉明锐化 

分 类 号：TN713[电子电信—电路与系统]