Filter

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Filter may refer to:

Contents 1 Chemistry, engineering and materials 2 Optics and photography 3 Signal processing 4 Computing 5 Philosophy 6 Other 7 Proper name 8 See also

[edit] Chemistry, engineering and materials

In chemistry, engineering, or household usage, a device to separate mixtures. See:

• Filter (chemistry)
• Water filter
• Air filter
• Oil filter
• Pneumatic filter
• Filter (aquarium)
• Filter paper

[edit] Optics and photography

In optics and photography, a device to remove, or to enhance, certain ranges of wavelengths (colors) of light. See:

• Filter (optics)
• Photographic filter
• Infrared filter
• H-alpha filter
• Chelsea filter

[edit] Signal processing

In signal-processing applications (such as electronics, music, and picture processing): a mathematical algorithm, or an electrical or mechanical device, is used to remove part(s) of a signal. See:

• Electronic filter
• Audio filter
• Line filter
• Digital filter
• Wiener filter
• Kalman filter
• Low pass filter
• High pass filter
• Band pass filter
• Texture filtering

[edit] 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

[edit] Philosophy

• Category-based filtering of perception — according to (objectivist interpretations of) Kant

[edit] Other

• In mathematics, a certain kind of subset of a partially ordered set. See
  • Filter (mathematics)
  • Filtering problem (stochastic processes)
• In psychology, a type of learning blockage. See
  • Affective filter
• In transportation. See
  • Filtering forward, a practice that cyclists use to pass slow or stopped congested traffic

[edit] Proper name

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

[edit] See also

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

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