本设计通过改变各种给定数字滤波器模型的参数来改变零点极点，分析出参数和频率之间的关系，用户可根据要设计滤波器的指标，按照一定规律调整参数，来逼近滤波器的设计指标，最后通过级联改善滤波器特性。

最佳答案 - 由投票者6个月前选出

The zero pole was changed in this design by the change of various given parameters in digital filter model, The relationship between parameters and frequency were analized. Furthermore, the design indexes were approached based on the regulated parameters according to some rules and some indexes to designed filter model. And finally, the characteristics of filter model were improved by the series structure.