Bandpass Filter
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.
Optics
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.
See also: Band Stop Filter, Electronic Filter, Frequency.
Subjects: Noise & Vibration Optics Signal Processing