滤波器的机辅设计

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。

Computer Aided Design of Filters

A computer aided filter design algorithm is presented, which not only allows us to design low-pass; high-pass; band-pass and band-reject filters using one single program, but also provides two different approximations, namely the Butterworth(type-B) and the Chebyshev(type-C) approximations to meet the given filter requirement. Thus the designer may benefit from making the conveiennce of the time-saving program to compare the results obtained by two different approximation methods for the four basic filter types mentioned above. Our algorithm is based on generating the normalized biquadratic form of the approximation function by first computing the poles of the desired filter. The flow diagram of the computer program, as well as some practical examples are also presented