LDI数字椭圆滤波器的设计  

Design of LDI elliptical digital filter

作　　者：郑亚民[1] 

机构地区：[1]山东大学威海分校电子系,山东威海264209

出　　处：《山东大学学报（工学版）》2004年第4期4-7,共4页Journal of Shandong University（Engineering Science）

基　　金：山东大学威海分校科研基金项目 (XLO3 0 44 )

摘　　要：介绍了一种设计LesslossDiscreteIntegrator(LDI)椭圆型DigitalFilter(DF)的方法 .即利用椭圆型AnalogFilter(AF)作为原型 ,找出元件的双线性变换 (BLT)和LDI变换之间的关系进行预补偿 ,再进行信号流图的等效变换 .最后用LDI变换作为电路的基本模块 ,去实现双线性变换的椭圆传递函数 .以此方法设计出一个低通LDI数字椭圆滤波器 ,并利用MATLAB SIMULINK导出滤波器的传递函数 ,大大简化了整个设计过程 .A method to design LDI ellipse DF is introduced. The ellipse AF is used as the prototype to find out the relation between BLT and LDI transform of element so as to make precompensation. Then,equivalent transform to signal flow graph are made and the ellipse transfer function of BLT is realized by using LDI transform as the basic template. Finally,a lowpass LDI ellipse filter is designed based on this method and its transfer function is obtained by MATLAB/SIMULINK,the whole design process is predigested successfully.

关 键 词：LDI变换 双线性变换 数字滤波器 

分 类 号：TN911[电子电信—通信与信息系统]