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  • Acoustics:
  1. A filter that attenuates signals both below and above the desired passband.
  2. Filter with a single transmission band or passband with relatively low attenuation extending from a lower band-edge frequency greater than zero to a finite upper band- edge frequency. Source: Glossary of Terms in Noise Control Engineering
  • Electronics:
  1. An electronic network which transfers through it a specific band of signal frequencies.