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在简要介绍模拟滤波器数字逼近的几种方法的基础上，着重分析双线性变换法的原理、算法及软件实现方法。本方法简化了模拟滤波器的数字化，也为分析数字滤波器的稳定性能提供了方便。
Based on the brief introduction of several methods of digital approximation of analog filter, the principle, algorithm and software implementation of bilinear transform are emphatically analyzed. This method simplifies the digitization of the analog filter and also facilitates the analysis of the stability of the digital filter.