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本文介绍一种滤波器的机辅设计方法,它不仅能把低通、高通、带通、带阻四种基本类型的滤波器设计统一在一个程序内,而且用这同一程序,可对Butter-worth(B型)和Chebyshev(C型)两种不同逼近方法进行计算。这样,在更短的时间内,可对不同类型滤波器的两种不同逼近方法的设计结果进行比较,给设计工作者带来很大的方便。本算法是先求出所要求的滤波器的工作传输函数的极点,然后由极点求出该波器的双二次型归一化传输函数。文中给出了程序流图和设计实例。
This paper introduces a filter machine auxiliary design method, which can not only low-pass, high-pass, band pass, band-stop filter design of the four basic types of unity within a program, but with this same program, Butter- worth (B type) and Chebyshev (C type) two different approaches to calculate. In this way, the design results of two different approximation methods of different types of filters can be compared in a shorter period of time, which brings great convenience to the designers. The algorithm first finds the pole of the required work transfer function of the filter and then finds the biquadratic normalized transfer function of the filter from the poles. The program flow chart and design examples are given in this paper.