<Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (February 2008) (Learn how and when to remove this template message) </Td> </Tr> <P> A band - pass filter, also bandpass filter or BPF, is a device that passes frequencies within a certain range and rejects (attenuates) frequencies outside that range . </P> <P> An example of an analogue electronic band - pass filter is an RLC circuit (a resistor--inductor--capacitor circuit). These filters can also be created by combining a low - pass filter with a high - pass filter . </P> <P> Bandpass is an adjective that describes a type of filter or filtering process; it is to be distinguished from passband, which refers to the actual portion of affected spectrum . Hence, one might say "A dual bandpass filter has two passbands ." A bandpass signal is a signal containing a band of frequencies not adjacent to zero frequency, such as a signal that comes out of a bandpass filter . </P>

Bank of band-pass filters to the analog signal