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 bilinear design method is the better and the most common one of the four design methods of the IIR digital filter. But bilinear transformation is a kind of fractional calculation, the calculation amount increases sharply with the increase of filter order, the calculation is very complicated and error-prone. The use of virtual axis translation, ratio, inversion coefficient conversion program is calculated quickly and accurately.