Filter may refer to:

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

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

Signal processing

In signal-processing applications (such as telecommunications, music, and picture processing): a mathematical algorithm, or an electrical or mechanical device, to modify the contents of signals and to extract their salient features. See:

* electronic filter
* audio filter
* line filter
* digital filter
* Wiener filter
* Kalman filter

See filtering problem (stochastic processes) for the mathematical formalism.


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


* Category-based filtering of perception — according to (objectivist interpretations of) Kant
* interpretive filtering through concepts according to existentialism


* 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 forward, a practice that cyclists use to pass slow or stopped congested traffic.
* An aquarium filter.

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

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Look at other dictionaries:

  • Filter [1] — Filter. Strömt eine Flüssigkeit so durch einen porösen Körper, daß die in ersterer enthaltenen Suspensionen dem letzteren durch Adhäsion verbleiben[26] oder sich vor demselben festlegen, so nennt man den Vorgang Filtration, den Körper das Filter… …   Lexikon der gesamten Technik

  • Filter — Состав 2008 года в Кувейте …   Википедия

  • Filter — (m., n., nach fr. filtrer, it. feltrare, „durchseihen“; ursprünglich „durch Filz laufen lassen“ zu germanisch *felt „Filz“) steht für: Geräte, Bauteile oder Baugruppen: Filter (Elektrotechnik), eine elektrische Schaltung, die bestimmte Frequenzen …   Deutsch Wikipedia

  • Filter — Saltar a navegación, búsqueda Filter Información personal Origen Cleveland, Ohio, Estados Unidos …   Wikipedia Español

  • filter — [fil′tər] n. [ME filtre < OFr < ML filtrum, feltrum, felt, fulled wool (used for straining liquors) < Gmc: see FELT1] 1. a device for separating solid particles, impurities, etc. from a liquid or gas by passing it through a porous… …   English World dictionary

  • Filter — Fil ter, v. t. [imp. & p. p. {Filtered}; p. pr. & vb. n. {Filtering}] [Cf. F. filter. See {Filter}, n., and cf. {Filtrate}.] To purify or defecate, as water or other liquid, by causing it to pass through a filter. [1913 Webster] {Filtering paper} …   The Collaborative International Dictionary of English

  • Filter — Pays d’origine  États Unis, Cleveland (Ohio) Genre musical Rock industriel Post grunge …   Wikipédia en Français

  • Filter — Sm std. (16. Jh., Form 19. Jh.) Entlehnung. Zunächst in lateinischer Form entlehnt aus ml. filtrum n., eigentlich (Seihgerät aus) Filz , dieses aus g. * filta Filz (Filz), wohl über das Niederfränkische. Verbum: filtern, filtrieren.    Ebenso… …   Etymologisches Wörterbuch der deutschen sprache

  • Filter — Fil ter, n. [F. filtre, the same word as feutre felt, LL. filtrum, feltrum, felt, fulled wool, this being used for straining liquors. See {Feuter}.] Any porous substance, as cloth, paper, sand, or charcoal, through which water or other liquid may …   The Collaborative International Dictionary of English

  • Filter [2] — Filter. In neuerer Zeit haben die Schnellfilter Verbreitung gefunden. Sie werden verwendet: 1. zur Klärung natürlich trüben Rohwassers für gewerbliche Zwecke; 2. zur Klärung von chemisch vorbehandeltem Wasser; 3. zur Vorbehandlung von Wasser vor… …   Lexikon der gesamten Technik

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