A cicuit or device whose purpose is to control electrical energy at a given frequ-ency or over a range of frequencies,Groups of passive components are commonly used to construct many types of filters,These passive components include resistors, cap-acitors
A cicuit or device whose purpose is to control electrical energy at a given frequ-ency or over a range of frequencies,Groups of passive components are commonly used to construct many types of filters,These passive components include resistors, cap-acitors
指一电路或装置其功能是在一特定频率或频带下控制电能，不同种类的被动元件常被用来组成不同的滤波器，这些被动元件包含电阻，电容及电感。