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快速设计滤波器一般采用查表法，但表格的参数有限。在计算法设计滤波器的基础上导出有源滤波器的快速设计方法，从而可快速、精确地设计有源滤波器，以适应各种实际需要
Fast design filters generally use look-up table, but the parameters of the table are limited. The rapid design method of active filter is derived based on the design of filter, so that the active filter can be designed quickly and accurately to meet various practical needs