A

David

Darling

band-pass filter

bandpass filter

A band-pass filter is a filter that passes all frequencies between a low-frequency cutoff point or a high-frequency cutoff point. The cutoff frequencies are usually taken to be the 3dB points.

 

A high-pass filter is a filter that passes all frequencies above a cutoff frequency; a low-pass filter is one that passes all frequencies below a certain cutoff frequency.