A series of Gaussian digital approximation filters used in roundness measurement were designed on the basis of approximation method and bilinear transformation.
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。
The author describes the approximation and method of undetermined coefficients used in the practice of flowrate measurement.
介绍了笔者在流量计量实践中所用过的逼近法和待定系数法。
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