To clarify wine (removing dead yeast cells and other suspended matter) by passing it through a filtering machine prior to bottling.
filter is any word that has been specified to be removed from the player's move before it is processed by the interpreter.
A device used to remove unwanted frequencies from an audio signal thus altering its harmonic structure. Low Pass filters are the most common type of filter found on music synthesizers. They only allow frequencies below the cutoff frequency to pass (Low Pass). High Pass filters only allow the high frequencies to pass, and Band Pass filters only allow frequencies in a selected band to pass through. A Notch filter rejects frequencies that fall within its notch.
A filter filters out certain frequencies in the sound. There are four main types: a low-pass, high-pass, band-pass and notch, which are covered elseware in the glossary. Filters have two controls - the frequency control selects at which frequency the filter should start operating and the resonance control creates a peak just before the bit where it starts filtering out frequencies. This is used to create acid-type sounds.
A device used to clean aquarium or drinking water. They come in three broad categories: mechanical, chemical, and biological.
suitable arrangements of capacitors and inductors which filter out the oscillating component of the voltage
As with camera filters, telescope filters are used to selectively block or pass certain wavelengths or colors.
A device that passes a signal or a range of signals and eliminates all others.
A device which affects the bandwidth of a signal. There are three types: High pass, which passes signal above a predetermined frequency, either preset or user selectable, Low pass, which passes a signal below a predetermined frequency, and bandpass, which passes a predetermined frequency band.
Used during the winemaking process to remove yeast and bacteria from wine.
(verb) To reduce the amount of information in a signal. (noun) A circuit or process that reduces the amount of information in a signal. Analog filtering usually removes certain frequencies. Digital filtering (when not emulating analog filtering) usually averages together multiple adjacent pixels, lines, or frames to create a single new pixel, line, or frame. This generally causes a loss of detail, especially with complex images or rapid motion. See letterbox filter. Compare to interpolate.
Filters are used on air conditioning units to remove allergens, odors, mold and other undesirable elements from the air that is circulated around your home. Filters must be cleaned regularly in order to keep your air conditioning unit working properly.
A circuit that removes or acts on certain frequency signals above or below a predetermined point called a cut-off frequency.
In data or signal analysis, a function that selectively discriminates against some of the information passing through it. The discrimination is usually performed on the basis of frequency.
This is a device which allows a particular spectrum (range of frequencies) to pass through it but prohibits (attenuates) all others from passing.
1) See Colour. 2) Electronic device to isolate and redirect specific frequencies in a speaker system.
1. A piece of coloured glass, plastic, or other material that selectively absorbs some of the wavelengths of light passing through it. Some filters affect colour or tone other can, for example, cut out unwanted reflections, help to reduce haze or to be used to create a variety of special effects. 2. To use such a filter to modify the wavelengths of light reaching a light-sensitive material.
A device containing varied types of material, especially used to extract impurities from water, such as bacteria and debris.
Used to reject or enhance the view for certain objects. Filters can be photographic or visual.
To separate an insoluble solid from a liquid by pour it through a solid (usually paper) to trap the solid particles and separate them from the liquid.
In general, a filter accepts the desired and rejects the undesired. Every filter has a specific purpose. In electronics, for example, if you have some high frequency noise mixed with the signal that you want, then a low pass filter is used to pass the signal and reject the (high frequency) noise. In software, a filter allows the application to open a file of a specific format.
A device that removes undissolved particles from water by recirculation of the water through a porous substance.
Filters are devices which clean the water. They come in three broad categories: mechanical, chemical, and biological. There are many different types of filters, such as...
An electronic device that modifies the signal amplitude as a function of frequency content.
tank which is used to filter fine debris out of pool water. Types of filters are: Cartridge, Diatomaceous Earth (DE), Regenerative DE and Sand
In raster graphics, a mathematically defined operation for removing long-range (high-pass) or short range (low-pass) variation. Used for removing unwanted components from a signal or spatial pattern.
(component) A network of resistance, capacitance, and inductance designed to pass certain frequencies and attenuate all others. The main types are low pass, high pass, band pass, and band reject.
A passive or active frequency selective circuit designed to modify a signal or source of power
to move water through porous material(s) to separate out unwanted particles . Drinking water is passed through large filters made of gravel, sand and coal that separate out particles held in supension. Click here for a detailed diagram of one our tretament plants to learn more about how we use filters.
An electronic device that allows only certain frequencies to pass.
(electrical) A device that passes a signal or range of signals and eliminates other signals. floating ground A circuit whose electrical common point is not at earth ground potential or the same ground potential as the circuitry it is associated with.
a device or material that allows liquid through but stops solids/particles of a certain size, so the fluid is cleaned
Term generally applied to a device used to remove solid contaminate from a liquid or gas. A filter, as referred to in the industry today, is limited to a device which removes solid contaminates only. If a device is used to remove solid and liquid contaminates, it is referred to in general terms as a separator, filter separator or entrainment separator. The term filter is sometimes erroneously used to describe the medium used inside the housing or filter case, but the correct use should be filter element, cartridge etc.
(1) noun: Any material which, by absorption or reflection, selectively modifies the radiation transmitted through an optical system. (2) verb: To remove a certain component or components of radiation, usually by means of a filter, although other devices may be used. (3) Kernel used in filtering transformation.
smart hikers do this to water to remove harmful bacteria
Porous material through which fluids or fluid - and solid mixtures are passed to separate matter held in suspension.
1. A device used to remove particles suspended in the water by pumping water through a porous substance or material. 2. This is normal water flow through the filter, say, top to bottom. This is where the valve sits 99% of the time. To view our range of filters click here.
A pattern or mask through which only selected data is passed. The VisualAge C++ IDE allows views to be filtered.
A circuit or device whose purpose is to control electrical energy at a given frequency or over a range of frequencies. Groups of passive components are commonly used to construct many types of filters, including resistors, capacitors, and inductors.
A device or network that can separate parts of signals depending on their frequency.
Any of various electric, electronic, acoustic, or optical devices used to reject signals, vibrations, or radiation of certain frequencies while passing others. Electronically, filters can be as simple as a single capacitor, or as complex as a dedicated computer circuit. For audio use the most common electronic filter is a bandpass filter, characterized by three parameters: center frequency, amplitude (or magnitude), and bandwidth. Bandpass filters form the heart of audio graphic equalizers and parametric equalizers.
A porous device used to remove solids from air or water.
A porous medium through which a fluid is passed to separate it from material suspended in it.
a circuit which is frequency dependent. The "pass band" is the range of frequencies allowed through, and the "stop band" is that range of frequencies which are blocked
A device employing filter leaves or tubes of woven wire cloth, often with an additional filter medium. Filters are used for the clarification of a liquid or gaseous fluids or the precision removal of particles known to be present.
A device used to remove dust and other particles from air for the purposes of reducing the load on the respiratory system and to protect the HVAC equipment. Filters vary greatly in particle arrestance; the higher the MERV rating, the better the filter.
A device which removes particulate and chemical impurities from, and circulates aquarium water. See article.
a porous article or mass (such as plants or sand) through which unwanted particles are separated out Minnehaha: Point-Source Pollution
A device that removes unwanted frequencies from a signal. In order to remove the high-frequency noise from the phone line and optimize the phone line for DSL, filters are provided with ConnectTime DSL.
(1) A device for eliminating selected frequencies from the sound spectrum of a signal and perhaps (in the case of a resonant filter) increasing the level of other frequencies. See lowpass filter. (2) A device (MIDI filter) that eliminates selected messages from the MIDI data stream.
A circuit element or group of components which passes signals of certain frequencies while blocking signals of other frequencies.
A way of removing debris and extra nutrients from the water
A device which modifies the frequency spectrum of a signal, usually while it is in electrical form
a device that attenuates or removes certain elements or data from an audio waveform or data stream. A MIDI data filter removes certain messages (pitch bend, program change, active sensing, etc.) from the MIDI data stream. See bandpass filter, band-reject filter, highpass filter, lowpass filter.
A device that removes foreign particles from air or fluids (gas or oil).
a device whose primary function is the retention by porous media of insoluble contaminants from a liquid.
An electronic circuit designed to selectively pass certain sound frequencies. Also see crossover.
Filters that separate high frequency (ADSL) and low frequency telephone service (standard telephone service) signals at both the end user and central office end points.
Networks designed to either pass or reject the transfer of signals at certain frequencies to a load.
As it applies to home heating and cooling equipment: a medium that acts like a strainer to remove dirt and unwanted particles from the air which passes through it.
A device which removes contaminates from another material. for example lumps may be filtered out from paint or water may be filtered out from the compressed air.
Any device or porous substance used for cleaning liquid or gas by removing suspended matter.
is a device or computer algorithm that removes specified frequencies from a signal.
A programming concept through which records are compared against a set of desired values, and accepted or rejected. For example a file of email addresses could be filtered by service provider to eliminate "free" email systems.
An electronic device that blocks certain frequencies while allowing other frequencies, such as 60 hertz (Hz), to pass.
1. A circuit made up of resistors, capacitors and/or inductors to change frequency response, phase response, or other characteristics of a given signal.
A filter is a frequency sensitive network that functions by removing unwanted noise and/or ripple components in rectified outputs.
A device (typically ceramic but metallic variants are also available), used to trap particulate matter.
a canister device with a screen of a specified mesh to catch particles large enough to clog emitters.
happens in a riparian corridor by removing sediment and other suspended solids from surface runoff before they enter streams and rivers
a selective device that transmits a desired range of matter or energy while substantially attenuating all other ranges. Thus an electric filter is a network that transmits alternating currents of desired frequencies while substantially attenuating all other frequencies.
A transfer function used to modify the frequency or time response of a control system.
A device used to block or reduce signals at certain frequencies while allowing others to pass through.
A porous membrane or mat of fibers used to collect particles from the air.1
A filament designed to remove small particles from the air supply.
a resonator which is used to transmit or pass on sound, and which is selective with respect to frequency. a device that selectively transmits a range of frequencies. A low-pass filter transmits frequencies below a specified frequency, a high-pass filter transmits frequencies above a specified frequency, and a band-pass filter transmits frequencies within a band defined by a lower and higher frequency. (H:551)
A circuit that is designed to propagate signals of a desired frequency or frequency interval and to reject all other signals.
Material that removes unwanted particles, such as dust and pollen, from the air that passes through it. Click filters to learn more about these.
A capacitor, inductor or resistor, or some combination of capacitors, inductors and/or resistors, intended to reduce the amount of electromagnetic energy at unwanted frequencies from being conducted along a cable or wire.
A device utilizing a granular material, woven cloth or other medium to remove pollutants from water, wastewater or air.
A technique for checking a number of items (e.g. file types, user commands, web site addresses) allowing only those that are acceptable to pass through a barrier, such as a Firewall.
a device, such as a piece of felt or cotton, through which the sap is poured to remove impurities
a logical or physical device used to selectively permit or deny communications between particular computer systems.
An alluminium device, cloth pad, cotton wool tube, or similar device inserted in the pipe to trap nicotine and tars.
Specifically, a device or system for the removal of solid particles (suspended solids); in general, includes mechanical, adsorptive, oxidizing and neutralizing filters.
A devise that removes undissolved waste particles from water by recirculating the water through a porous substance, a filter medium or element
A screen or mesh through which gas or a liquid passes to remove impurities.
A digital or analog component which has the effect of removing unwanted frequencies from a sound. (See "Low Pass Filter")
Filters are used to block out undesired frequencies. There are two types of filters: band pass and rejection. A band pass filter permits only the desired range to pass through, while the rejection filter attenuates an undesired range of frequencies.
A circuit that selects the frequency of desired channels. Used in trunk and feeder lines for special cable services such as two-way operation.
A mechanism (or operation in computers) that allows only certain things to pass.
A type of union or reducing union which traps the particulates in a stream. The filtering element is typically a mesh screen or sintered frit.
Any device that removes impurities through a straining process.
A device within a hydraulic system that is used to remove contaminants from the oil.
A fibrous medium used in respirators to remove solid or liquid particulates from the air before it enters the facepiece (this term may be used interchangeably with cartridge).
A device containing a porous material or a material itself, through which a liquid or gas is passed in order to separate suspended particulate matter. Common filter materials are activated charcoal, polypropylene and HEPA (high efficiency particulate air [filter]).(Added: 21-Sep-2001 Rating: 0 Votes: 0)
A device that removes unwanted frequencies or noise from a signal.
a device used to remove solids from a mixture or to separate materials. Materials are frequently separated from water using filters.
Consists of a combination of components that allows only certain frequencies, or a band of frequencies, to pass.
A media component used in respirators to remove solid or liquid particles from the inspired air.
A flat optical lens which promotes the passing of some colors while impeding other colors.
A fine mesh or porous material that removes particles from passing fluids.
Generally a particulate removal device located within the air handler before the heat exchanger. Filters range in efficiency from 25 to 99.999%.
The device that removes debris from the pool water. The water is delivered to the filter through the skimmer and the main drain.
A pattern or mask through which only selected data is passed. Common filters include spam filters, which block email sent from specified sites.
A devise used to remove solid particles from liquid. It removes smaller paricles than a strainer.
A device which captures particles of sand or other matter which might plug orifices in the lateral drip lines.
A device or structure for removing suspended solid, colloidal material, or BOD from wastewater.
An electrical circuit which is part of every Lutron dimmer that is intended to reduce radio frequency interference and lamp buzz.
A device that acts like a strainer to remove dirt or undesired particles.
An electrical circuit that passes frequencies within a specified frequency band and attenuates signals that fall outside of that frequency band.
A device that removes undissolved or suspended particles from water that is pumped through it. Common types include, sand, DE, and cartridge.
a device of varying types and qualities used to remove impurities from air, gases or liquids. Always keep your filters clean! Dirty air conditioning filters can be the largest cause of unnecessary breakdowns
A device that removes un-dissolved or suspended particles from water by re-circulating the water through a porous substance (a filter medium or element). The three types of filters used in spas are sand, cartridge and D.E. (diatomaceous earth).
A device that stops large particles from flowing through, but allows smaller particles.
A device that removes solid contaminants, such as dirt or metal particles, from a liquid or gas (air is a gas), or that separates one liquid from another, or a liquid from a gas. The term filter describes the complete unit ... housing, filter element, internal by pass.( 050)
A circuit or device that permits the passage of a signal at a specific frequency while blocking the passage of signals at other frequencies.
A device used to clean the aquarium water. The three basic types are Mechanical, Chemical, and Biological. All three types of filtering should be used in your aquarium.
The removal of designated impurities by passing the wort through a medium, sometimes made of diatomaceous earth ( made up of the microscopic skeletal remains of marine animals). Yeast in suspension is often targeted for removal.
A filter is a way of treating or adjusting data before it is analyzed. Examples are the Hodrick-Prescott filter or Kalman filter. More exactly, a filter is an algorithm or mathematical operation that is applied to a time series sample to get another sample, often called the 'filtered' data. For example a filter might remove some high-frequency effects from the data; or detrend it; or remove seasonal frequencies but leave monthly frequencies in. Source: econterms
A electronic device that permits certain frequencies to pass while stopping others. A tone control on a radio is a good example of a simple filter, where it filters out highs as you turn it.
A frequency-sensitive network that attenuates unwanted noise and ripple components of a rectified output.
A device that removes particles as water passes through the medium. Most pool and spa filter media are sand, diatomaceous earth (D.E.) and cartridge.
A fibrous medium used in respirators to remove solid or liquid particles from the air stream entering the respiratory enclosure.
Network consisting of capacitors, resistors and/or inductors used to pass certain frequencies and block others.
A device to clean pool water by filtering out dirt, oils, etc. Filters may use diatomaceous earth (DE), cartridges with a fine-mesh element, or a sand bed as the filtering agent.
A circuit element or components that allows signals of certain frequencies to pass and blocks signals of other frequencies.
A device for removing dust particles from air or unwanted elements from liquids.
A device for use on power or signal lines, specifically designed to pass only selected frequencies and to attenuate substantially all other frequencies.
A device that blocks signals or radiation of certain frequencies while allowing others to pass unaltered.
Mechanical method of removing solid contaminates from the spa water. The smaller the pores of the filter, the more efficient it will be at removing small particles. Fine filters, because of their efficiency, require more frequent changing and/or cleaning.
A selective network of resistors, inductors, or capacitors which offers comparatively little opposition to certain frequencies or direct current, while blocking or attenuating other frequencies.
Device that while selectively passing desired frequencies removes undesired ones.
An accessory to or component of an IV administration set; a device that is designed to eliminate entrapped air or inadvertent particulates and microbial contaminants from solutions prior to patient administration.
Any physical device or mathematical function that is used to modify a spectrum.
Any electrical circuit or mechanical device that removes or attenuates energy at certain frequencies. See Crossover Network.
A device or process that selectively transmits frequencies. In optics, the material either reflects or absorbs certain wavelengths of light, while passing others.
An electronic circuit used to block certain undesirable signal frequencies.
In a protocol analyzer, a filter is a way of limiting the amount of data captured or displayed to help the user to focus in on the data of interest. Frontline's Ethertest uses two different types of filters. Capture Filters specify the data to be captured by Ethertest, so that only the data the user is concerned with is captured. Display Filters don't affect what data gets captured, but limit the data the user sees on the screen. For example, a capture filter could be set up so that only the data passing between two IP addresses was captured, or a display filter could be imposed on data already captured to limit the data displayed to that which passed between two IP addresses.
A pattern or mask through which data is passed to separate specified items. For instance, a filter used in e-mail or in retrieving newsgroup messages can allow users to automatically discard messages from specific users.
A device for preventing debris etc., from entering a system. The filter usually incorporates a small mesh screen and drainvalve for cleaning. Generally installed at the point of connection for leaky pipe, microspray and drip irrigation systems.
To process a clip with spatial or frequency domain methods. Each pixel is modified by using information from neighboring (or all) pixels of the image. Filter functions include blur (low-pass) and crisp (high-pass).
An electronic device that blocks the passage of certain frequencies while allowing other frequencies to pass.
is used to remove solid material from a gas or liquid buy means of straining.
An electrical circuit or mechanical device that removes or attenuates energy at certain frequencies. . An electrical circuit or mechanical device that removes or attenuates energy at certain frequencies. .
Electrical networks that transmit signals with frequencies within certain designated ranges and suppress signals of other frequencies.
to strain out wine solids by mechanical means, large or small.
A device through which air is passed in order to separate suspended contaminates. The life of cylinders and valves is lengthened by using filters.
a device that removes particulate matter from a swimming pool utilizing a "porous media". The e commonly used filters are Sand, Cartridge & DE.
An electrical circuit which blocks signal below or above a predetermined frequency. The filter rate may be shallow, steep, or in the case of a digital filter of 'brick wall' type.
A type of equalizer which is designed to reduce the energy at a certain frequency or in a certain frequency band. Filters always act as subtractive devices, never adding anything to a signal.
a circuit which permits certain frequencies to pass easily while inhibiting or preventing others. Typical filters include low pass, high pass, band pass, and band reject.
A device used to screen dirt and debris from the water. Filters are important in low volume systems because the small emitters can easily become clogged.
A device used to reject all but a specified range of frequencies. A bandpass filter allows only hose signals within a given band to be communicated. A rejection filter, the mirror image of a andpass filter, eliminates those signals within a specified band but passes all other frequencies.
The filter cleans the spa and removes particles and debris and protects the equipment from foreign substances.
a porous medium (disposable media, wedge-wire or mesh screen) through which liquid is passed to separate and trap particles held in suspension.
A device that removes undissolved particles from water through a porous filter medium (sand, cartridge, DE).
A function that cuts off a specific frequency band to change a sounds brightness, thickness and other qualities. A few common filter types are Low-pass Filter, High-pass Filter and Bandpass Filter.
The timbre, also known as the color or nature of your sound is shaped by the filter. It can accentuate or attenuate certain frequency ranges. It's basically a specialized EQ. Synths can have hi, low, and band pass filters. A resonance control really brightens (to the point of squeeling self-oscillation) certain frequencies around the cutoff point. You adjust the cutoff to dial in where the filter begins affecting frequencies. Many filters have an Envelope as well which is used to adjust the attack, decay, sustain and release of the filter's effect on the sound being processed.
To remove suspended particles from a wine before bottling to assure future clarity and stability. Too much filtering is believed to strip a wine of character.
A filter is an electrical circuit which is specifically designed to attenuate or eliminate unwanted frequencies from a broad range of frequencies. They are usually described as Low Pass, Band Pass and High Pass Filters
Verb: To pass fluid containing suspended particles through a filter medium whereby the particles are separated from the fluid. Noun: A "device" for carrying out the filtration process, consisting of the filter medium and suitable hardware for constraining and supporting it in the path of the fluid.
is a linear operation that converts one time series into another. Low-pass, band-pass and high-pass filters are used to separate different signals from a time series. An example is a running mean, which removes high frequency fluctuations ( low-pass filter) from a series [pg. 13-15, 5
Cloth or other media used to remove particles from a liquid substance.
Electronic device which boosts or cuts certain frequencies, one of the main parts of an equalizer.
A device incorporated into a hydraulic system to remove contaminants from the oil. FITTING: A device for connecting hose or pipe to hydraulic components.
Any device used to remove unwanted particles or compounds from aquarium water. Filters come in a variety of styles, but most fall into three main categories: biological, chemical, or mechanical.
A device which removes foreign matter from the working medium.
A filter is a device such as a filtering router. A filter allows for the creation of ACLs to control access to devices, resources or networks. It is usually used to screen open ports, so that only valid data is allowed into, or out of, those ports.
The removal or attenuation of a certain band of frequencies.
A selective network comprised of capacitors, inductors and / or resistors which passes a specific band of frequencies and attenuates the out of band frequencies.
1) A transparent material that is over a light that can affect the intensity, color, and focus of the light. 2) Circuit that selectively attenuates portions of the audio frequency spectrum. A filter is the opposite of the traditional equalizer, which selectively boosts, but for the purpose of modern convenient control of sound on mixes and equalizer units, the circuits of tone-altering controls usually incorporate the dual abilities to equalize and filter by simply rotating a knob one way or another.
A device utilizing filter media for particle retention for clarification of a liquid or gaseous fluids.
A porous, fibrous material in cylinder form thatâ€(tm)s called an element. It allows water to pass through while it collects particles, organic matter, oils, lotions and foreign debris that accumulates in hot tub water. Cartridge type element is almost universally employed, though DE – diatomaceous earth – is in rare use.
A device to remove solid material from a fluid.
A device used to remove specific frequencies from a signal.
any device or porous substance used as a strainer for cleaning fluids by removing suspended matter.
A complex system within the transformer that consists of capacitors, inductors, and a resistor; it provides a relative small opposition to specific frequencies or direct current, as it blocks or attenuates other frequencies.
A circuit which attenuates signals above, below or at a particular frequency.
A MIDI filter is not an audio filter that is controlled by way of MIDI signals. It is a device that connects into the MIDI cable and blocks certain types of message from its output. For example, a filter could be added ahead of an instrument that has only omni modes and will respond to messages on all channels. By removing all channel messages except those on a particular channel, the instrument could effectively be used in mode 3.
A piece of pool equipment that removes debris by allowing trapping particles that are too large to pass through. Common types of filters include: Cartridge Filters, Sand Filters, and Diatomaceous Earth (D.E.) Filters.
A device or program that allows only certain information to be received through a network.
Used in various parts of the car and engine to filter impurities from oil, air, and fuel. Filters are changed during a full service or oil and filter change.
Refers to: 1) a program that has the function of translating data into a different format (e.g., a program used to import or export data or a particular file); 2) a pattern that prevents non-matching data from passing through (e.g., mail filters created within Eudora); and 3) in paint programs and image editors, a special effect that can be applied to a bit map.
An optical device which modifies the characteristics of radiation which is passed through it. Usually filters either attenuate all wavelengths of radiation a certain controlled amount or modify the optical passband of the radiation - eliminating selected wavelengths or bands while allowing others to pass.
Restlet filtering calls before passing them to an attached Restlet. The purpose is to do some pre-processing or post-processing on the calls going through it before or after they are actually handled by an attached Restlet. Also note that you can attach and detach targets while handling incoming calls as the filter is ensured to be thread-safe.
Electronic circuitry designed to pass or reject a specific frequency band.
A device installed as part of the water system through which water flows for the purpose of removing turbidity, taste, color, iron, or odor.
To remove lumps, excess liquid, or impurities by passing through paper or cheesecloth.
A device in the water circulating line, which screens out solid contaminants by passing the water through a filtering medium. Common media are sand, diatomaceous earth, or cartridges.
A type of electrical circuit that passes certain frequencies and reject all others. A circuit that reduces the variations in the output from the rectifier in a dc power supply.
1. A devise used for separating solid particles, impurities, etc. from a liquid or gas by passing it through a porous substance. 2. A device or substance that passes electric currents of certain frequencies or frequency range while preventing the passage of others. 3. A device or substance that partially or completely absorbs certain light rays.
A device or system for the removal of taste, turbidity, color, iron, or odor.
1. Any material that, by absorption or reflection, selectively modifies the radiation transmitted through an optical system. 2. To remove a certain component or components of radiation, usually by means of a filter, although other devices may be used. 3. A mathematical tool used to remove information within certain frequency (or wavelength) limits from a time (or space) series of data. Filters are commonly used to remove high (low) frequency oscillations from a dataset when oscillations of low (high) frequency are of interest.
A Filter is any porous device that allows the passage of air but traps air born particles, thus cleaning the air.
An active or passive circuit or device designed to block a certain frequency or range of frequencies.
A device which transmits only part of the incident energy and may thereby change the spectral distribution of energy.
A device that removes contaminants, by mechanical filtration, from the fresh air stream before the air enters the living space. Filters can be installed as part of a heating/cooling system through which air flows for the purpose of removing particulates before or after the air enters the mechanical components.
A device that allows certain parts of signals to pass through while stopping others.
an audio circuit that reduces the level of frequencies outside a preset range
A circuit or device that will allow certain frequencies to pass while rejecting others.
A device used to remove certain large particles such as yeast or bacteria from wine. Wines that are properly filtered suffer no damage to their flavor or aroma.
In chemistry and common usage, a filter is a device (usually a membrane or layer) that is designed to block certain objects or substances while letting others through. Filters are often used to remove harmful substances from air or water, for example to remove air pollution, to make water drinkable, to prepare coffee. In domestic food and drink preparation where bulk solids are removed from liquids, this is often called a strainer.
A water filter is a device which removes impurities from water by means of a fine physical barrier, chemical processes and/or biological process. Filters are used to cleanse water for irrigation, drinking water, aquariums, and swimming pools.
Many items requiring lubrication by petroleum products need the lubricant to be especially clean. The oil filter is a device used for this purpose, particularly in automotive and other applications for internal combustion engines.