●●● ●●●● ●●●● ●●●● ●●●●0 Functions: ●●●● ●●●● ● ● Filters are used to control the frequency response. 用来控制频响 Dallowing transmission at frequency within the passband of the filter.允许频率在滤波器带内的信号传输 2attenuation within the stopband of the filter. 频率在滤波器阻带内的信号衰减 Classifications by response根据响应分类： Low-Pass,high-pass,bandpass,bandstop LPF HPF BPF BSF 低通 高通 带通 带阻 2Filters are used to control the frequency response. 用来控制频响 Functions: ①allowing transmission at frequency within the passband of the filter.允许频率在滤波器带内的信号传输 ②attenuation within the stopband of the filter. 频率在滤波器阻带内的信号衰减 Classifications by response根据响应分类 : Low-Pass, high-pass, bandpass, bandstop LPF HPF BPF BSF 低通 高通 带通 带阻 2