An electronic network which transfers through it a specific band of signal frequencies, attenuating signals both below and above the desired passband.
The bandpass frequencies are normally associated with frequencies that define the half power points, i.e. the -3 dB points.
For a filter or thin-film coating, the wavelength range over which transmission is allowed and possibly maximized. Transmission above or below the bandpass range is restricted by design through absorption and/or reflection.
Term used to describe a bandpass shape when applied to program equalization.