2分类 ■1)经典滤波器从功能上分可分为： 低通滤波器(LPAF/LPDF):Low pass analog/digital filter 带通滤波器(BPAF/BPDF):Bandpass analog/digital filter 高通滤波器(HPAF/HPDF):High pass analog/digital filter 带阻滤波器(BSAF/BSDF):Bandstop analog/digital filter 全通滤波器(ABAF/ASDF):All pass analog/digital filter ■即它们每一种又可分为：数字(Digital)和模拟(Analog) 滤波器。2 分类 ◼ 1）经典滤波器从功能上分可分为： 低通滤波器（LPAF/LPDF):Low pass analog/digital filter 带通滤波器(BPAF/BPDF):Bandpass analog/digital filter 高通滤波器(HPAF/HPDF):High pass analog/digital filter 带阻滤波器(BSAF/BSDF):Bandstop analog/digital filter 全通滤波器(ABAF/ASDF):All pass analog/digital filter ◼ 即它们每一种又可分为：数字(Digital)和模拟(Analog) 滤波器