说明：  有限冲击响应模拟滤波器，可自行设计滤波器类型，拓扑结构、高、低截止频率 增益、窗函数等等，滤波效果好。
(Limited impact response analog filter, can to design filter types, topology structure, high and low cut-off frequency Gain, window function and so on, filtering effect is good. )