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Что (кто) такое air filter - определение
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Air filter
DEVICE COMPOSED OF FIBROUS MATERIALS WHICH REMOVES SOLID PARTICULATES FROM THE AIR
Filter (air); Air cleaner; Air filtration; Air filters; Universal air filter; Cabin air filter; Dust filter; Air Filters
A particulate air filter is a device composed of fibrous, or porous materials which removes solid particulates such as dust, pollen, mold, and bacteria from the air. Filters containing an adsorbent or catalyst such as charcoal (carbon) may also remove odors and gaseous pollutants such as volatile organic compounds or ozone.
air filter
DEVICE COMPOSED OF FIBROUS MATERIALS WHICH REMOVES SOLID PARTICULATES FROM THE AIR
Filter (air); Air cleaner; Air filtration; Air filters; Universal air filter; Cabin air filter; Dust filter; Air Filters
¦ noun a device for filtering particles from the air passing into an internal-combustion engine.
Photographic filter
![The 80A filter, mainly used to correct for the excessive redness of [[tungsten]] lighting, can also be used to oversaturate scenes that already have blue. The photo on the left was shot with a polarizer, while the one on the right was shot with a polarizer and an 80A filter.](https://commons.wikimedia.org/wiki/Special:FilePath/80a comparison.jpg?width=200 "The 80A filter, mainly used to correct for the excessive redness of [[tungsten]] lighting, can also be used to oversaturate scenes that already have blue. The photo on the left was shot with a polarizer, while the one on the right was shot with a polarizer and an 80A filter.")
![The ''LOMO effect'' imitates photos made with a low-cost Russian camera brand, named "LOMO". It is approximated by saturated central colors, blurred periphery, and darkened corners and edges ([[vignetting]]).}} effect.](https://commons.wikimedia.org/wiki/Special:FilePath/Verblühende Sauerkirsche.jpg?width=200 "The ''LOMO effect'' imitates photos made with a low-cost Russian camera brand, named \"LOMO\". It is approximated by saturated central colors, blurred periphery, and darkened corners and edges ([[vignetting]]).}} effect.")
CAMERA ACCESSORY CONSISTING OF AN OPTICAL FILTER
Daylight filter; Filter (photography); Lens filter; Filter ring; Filter mount; Filter thread; Cross screen filter; Photographic filters; Red Black and White filter; Camera filter; Series filter
In photography and cinematography, a filter is a camera accessory consisting of an optical filter that can be inserted into the optical path. The filter can be of a square or oblong shape and mounted in a holder accessory, or, more commonly, a glass or plastic disk in a metal or plastic ring frame, which can be screwed into the front of or clipped onto the camera lens.
Elliptic filter
.svg?width=200 "The frequency response of a fourth-order elliptic low-pass filter with '''ε''' = 0.5 and '''ξ''' = 1.05. Also shown are the minimum gain in the passband and the maximum gain in the stopband, and the transition region between normalized frequency 1 and '''ξ'''")
.svg?width=200 "A closeup of the transition region of the above plot.")
![Log of the absolute value of the gain of an 8th order elliptic filter in [[complex frequency space]] (s = σ + jω) with ε = 0.5, ξ = 1.05 and ω<sub>0</sub> = 1. The white spots are poles and the black spots are zeroes. There are a total of 16 poles and 8 double zeroes. What appears to be a single pole and zero near the transition region is actually four poles and two double zeroes as shown in the expanded view below. In this image, black corresponds to a gain of 0.0001 or less and white corresponds to a gain of 10 or more.](https://commons.wikimedia.org/wiki/Special:FilePath/Elliptic Filter s-Plane Response (8th Order).svg?width=200 "Log of the absolute value of the gain of an 8th order elliptic filter in [[complex frequency space]] (s = σ + jω) with ε = 0.5, ξ = 1.05 and ω<sub>0</sub> = 1. The white spots are poles and the black spots are zeroes. There are a total of 16 poles and 8 double zeroes. What appears to be a single pole and zero near the transition region is actually four poles and two double zeroes as shown in the expanded view below. In this image, black corresponds to a gain of 0.0001 or less and white corresponds to a gain of 10 or more.")
.svg?width=200 "An expanded view in the transition region of the above image, resolving the four poles and two double zeroes.")
SIGNAL PROCESSING FILTER
Cauer filter; Elliptical filter; Equiripple filter; Eliptic filter
An elliptic filter (also known as a Cauer filter, named after Wilhelm Cauer, or as a Zolotarev filter, after Yegor Zolotarev) is a signal processing filter with equalized ripple (equiripple) behavior in both the passband and the stopband. The amount of ripple in each band is independently adjustable, and no other filter of equal order can have a faster transition in gain between the passband and the stopband, for the given values of ripple (whether the ripple is equalized or not).
Electronic filter
![A low-pass electronic filter realised by an [[RC circuit]]](https://commons.wikimedia.org/wiki/Special:FilePath/1st Order Lowpass Filter RC.svg?width=200 "A low-pass electronic filter realised by an [[RC circuit]]")
ELECTRONIC CIRCUIT THAT REMOVES UNWANTED COMPONENTS FROM THE SIGNAL, OR ENHANCES WANTED ONES, OR BOTH
Electronic filters; Filter (circuits); Pi filter; Pi Filter; Frequency filter; BAW filter
Electronic filters are a type of signal processing filter in the form of electrical circuits. This article covers those filters consisting of lumped electronic components, as opposed to distributed-element filters.
Optical filter
![Coloured and [[neutral-density filter]]s](https://commons.wikimedia.org/wiki/Special:FilePath/Filter-optics-1.jpg?width=200 "Coloured and [[neutral-density filter]]s")
DEVICE THAT SELECTIVELY TRANSMITS LIGHT OF CERTAIN WAVELENGTHS
Optic filter; Wedge filter; Glass filter; Optical Filters; Optical band-pass filter; Optical bandpass filter; Filter (optics); Light filter
An optical filter is a device that selectively transmits light of different wavelengths, usually implemented as a glass plane or plastic device in the optical path, which are either dyed in the bulk or have interference coatings. The optical properties of filters are completely described by their frequency response, which specifies how the magnitude and phase of each frequency component of an incoming signal is modified by the filter.
UV filter
![''[[Dipsastraea pallida]]'' (hard coral) with signs of bleaching or crown-of-thorns starfish damage](https://commons.wikimedia.org/wiki/Special:FilePath/Favia pallida (hard coral) with signs of bleaching or crown-of-thorns starfish damage.jpg?width=200 "''[[Dipsastraea pallida]]'' (hard coral) with signs of bleaching or crown-of-thorns starfish damage")
![Photolysis of [[benzophenone-3]] in presence of [[benzotriazole]]](https://commons.wikimedia.org/wiki/Special:FilePath/Photolysis of Benzophenone-3.svg?width=200 "Photolysis of [[benzophenone-3]] in presence of [[benzotriazole]]")
MATERIALS THAT BLOCK ULTRAVIOLET RADIATION
UV Filter; UV haze filter; UV filters; User:Gabdal1/sandbox2; Ultraviolet filter
UV filters are compounds, mixtures, or materials that block or absorb ultraviolet (UV) light. One of the major applications of UV filters is their use as sunscreens to protect skin from sunburn and other sun/UV related damage.
Fréchet filter
In mathematics, the Fréchet filter, also called the cofinite filter, on a set X is a certain collection of subsets of X (that is, it is a particular subset of the power set of X).
Filter (signal processing)
DEVICE OR PROCESS THAT REMOVES UNWANTED COMPONENTS OR FEATURES FROM A SIGNAL, OR ENHANCES WANTED ONES, OR BOTH
SAW filter; Electric filter; Signal processing filter; Signal processing filters; Filter cutoff; Convolution as Filtering; Filtering (signal processing)
In signal processing, a filter is a device or process that removes some unwanted components or features from a signal. Filtering is a class of signal processing, the defining feature of filters being the complete or partial suppression of some aspect of the signal.
Neutral-density filter
DEVICE IN OPTICS THAT REDUCES LIGHT INTENSITY
ND filter; ND8; Neutral density filter; Gray filter; Grey filter
In photography and optics, a neutral-density filter, or ND filter, is a filter that reduces or modifies the intensity of all wavelengths, or colors, of light equally, giving no changes in hue of color rendition. It can be a colorless (clear) or grey filter, and is denoted by Wratten number 96.
