说明：  带通滤波器是指能通过某一频率范围内的频率分量、但将其他范围的频率分量衰减到极低水平的滤波器，与带阻滤波器的概念相对。一个模拟带通滤波器的例子是电阻-电感-电容电路(RLC circuit)。这些滤波器也可以用低通滤波器同高通滤波器组合来产生.
(A bandpass filter is a filter that can pass the frequency component within a certain frequency range but attenuates the frequency component of the other range to a very low level, and is relative to the concept of the band stop filter. An example of analog bandpass filter is the RLC circuit circuit. These filters can also be generated by combining low pass filters with high pass filters.)