Filter

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Filter may refer to:

Contents

[edit] Chemistry, engineering and materials

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

  • Filter (aquarium), critical components of both freshwater and marine aquaria
  • Filter (chemistry), a device (usually a membrane or layer) that is designed to physically block certain objects or substances while letting others through
  • Filter paper, a semi-permeable paper barrier placed perpendicular to a liquid or air flow. It is used to separate fine solids from liquids or air
  • Air filter, a device composed of fibrous materials which removes solid particulates such as dust, pollen, mold, and bacteria from the air
  • Oil filter, a filter to remove contaminants from engine oil, transmission oil, lubricating oil, or hydraulic oil
  • Pneumatic filter, a device which removes contaminants from a compressed air stream
  • Water filter, removes impurities from water by means of a fine physical barrier, a chemical process or a biological process. Filters cleanse water to various extents for irrigation, drinking water, aquariums, and swimming pools

[edit] Optics and photography

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

[edit] Turbulence modeling

In turbulence modeling, a procedure to dampen or remove the highest frequencies of the flow:

  • Filter (large eddy simulation), in the context of large eddy simulation (LES) is a mathematical operation intended to remove a range of small scales from the solution to the Navier-Stokes equations

[edit] Signal processing

In signal processing, especially electronics, an algorithm or device for removing part(s) of a signal:

[edit] Computing

In computing:

  • Filter (higher-order function), a higher-order function that processes a data structure (typically a list) in some order to produce a new data structure containing exactly those elements of the original data structure for which a given predicate returns the boolean value true
  • A program to process a data stream:
    • Filter (software), a computer program to process a data stream
    • Filter (Unix), a program that gets most of its data from its standard input (the main input stream) and writes its main results to its standard output (the main output stream)
    • Filter (video)
    • Email filter
    • Internet filter
    • Wordfilter, a script typically used on Internet forums or chat rooms that automatically scans users' posts or comments as they are submitted and automatically changes or censors particular words or phrases
  • BPF filter expression used in the qualification of network data
  • DSL filter, a low-pass filter installed between analog devices and a telephone line

[edit] Philosophy

[edit] Other

  • In mathematics, a certain kind of subset of a partially ordered set. See
  • In psychology, a type of learning blockage. See
    • Affective filter, an impediment to learning or acquisition caused by negative emotional ("affective") responses to one's environment. It is a hypothesis of second language acquisition theory, and a field of interest in educational psychology
  • In transportation. See
    • Filtering forward, a practice that cyclists use to pass slow or stopped congested traffic

[edit] Proper name

[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, a mechanical or physical operation which is used for the separation of solids from fluids (liquids or gases) by interposing a medium through which only the fluid can pass
  • Cigarette filter, a part of a cigarette intended to filter the smoke inhaled by a smoker
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