双线性变换法的主要优点是S平面与Z平面一单值对应，S平面的虚轴(整个jΩ)对应于Z平面单位圆的一周，S平面的Ω=0处对应于Z平面的ω=0处，对应即数字滤波器的频率响应终 止于折迭频率处，所以双线性变换不存在混迭效应。
...双线性变换法 IIR数字滤波器 Matlab [gap=1045]Keywords ：the same impulse response method; bilinear transformation method; IIR digital filter; Matlab; ...
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双线性变换法设计IIR滤波器可应用于图像处理等方面。
IIR filter, designed by double linear transform, can be used in the field of image processing.
对IIR的脉冲响应不变法、阶跃响应不变法、双线性变换法和直接设计法进行研究，得出IIR难以满足要求的结论。
For IIR, after researching Pulse Response Method, Step Response Method, Bilinear Transform Method, Direct Design Method, it is found that IIR is unsatisfactory.
文中用逼近法和双线性变换法，设计了用于圆度测量的高斯数字逼近滤波器，并给出了零相移的递归滤波算法，计算量小，计算效率高，易于实现。
A series of Gaussian digital approximation filters used in roundness measurement were designed on the basis of approximation method and bilinear transformation.
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