Filter

Filter may refer to:

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Chemistry, engineering and materials

• In chemistry, engineering, or household usage, a device to separate mixtures. See
  • filter (chemistry)
  • filter (water)
  • filter (air)
  • filter (oil)
  • pneumatic filter
  • cigarette filter.

Optics and photography

• In optics and photography, a device to remove or block certain wavelengths (colors) of light. See
  • filter (optics)
  • filter (photography)
  • infrared filter

Signal processing

• In signal processing applications such as telecommunications and music, an electronic or mechanical device, or mathematical algorithm, to modify the harmonic content of signals. See
  • electronic filter
  • audio filter
  • line filter
  • See filtering problem (stochastic processes) for the mathematical formalism.

Computing

• In computing:
  • filter (higher-order function)
  • A program to process a data stream:
    • filter (software)
    • filter (Unix)
    • mail filter
    • Internet filter
    • wordfilter
    • DirectShow
  • BPF filter expression used in the qualification of network data

Other

• In mathematics, a certain kind of subset of a partially ordered set. See
  • filter (mathematics).
• In psychology, a type of learning blockage. See
  • affective filter.
• In transportation, filtering, a.k.a. lane splitting

Proper name

• Filter (band), an industrial rock band
• Filter (television), a show on the G4 channel:
• Filter (magazine), an off-beat indie music magazine
• Helicon Filter, a raster graphics editor

See also

• Filter coffee, a method for preparing coffee
• Filter feeder, an animal that strains food particles from water
• Philter, a magical potion
• Filtration
• Conversion