IIR数字滤波器双线性设计的研究

Studay on Double-linearity Design of IIR Digital Filter

双线性设计法是IIR数字滤波器四种设计方法中比较好也是最常用的一种方法。但是双线性变换是一种分式计算,计算量随滤波器阶次的增加而急剧增加,计算十分繁琐且极易出错。而用虚轴平移、比例、颠倒系数变换程序计算则既迅速又精确。

The method of double-linearty design is a better and most common used one among the four methods of 11R digital fliter design. But, double-linearity transformation is a kind of fraction computation increases rapidly with the increase of the filter. Moreover, computation is very complicated and lengthy had easy to make mistakes. When adopting imaginary axle translation, proportion and rverse coefficient transformation program are applied to do the computation it will take less time and more precise result.