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Analog circuit which filters an electronic signal using an amplifier
An active filter is a type of analog circuit implementing an electronic filter using active components, typically an amplifier. Amplifiers included in
Active_filter
Electronic circuit
active-filter tuned oscillator is an active electronic circuit designed to produce a periodic signal. It consists of a bandpass filter and an active amplifier
Active-filter tuned oscillator
Active-filter_tuned_oscillator
Electronic device
Electronic filters are a type of signal processing filter in the form of electrical circuits. This article covers those filters consisting of lumped electronic
Electronic_filter
Device to perform harmonic elimination
Active power filters (APF) are filters, which can perform the job of harmonic elimination. Active power filters can be used to filter out harmonics in
Active_power_filter
Type of variable active electronic filter
A state variable filter (SVF) is a type of active filter in electronic circuits. In a state-variable filter architecture the signal and its successive
State_variable_filter
Type of signal filter
filter depends on the filter design. The filter is sometimes called a high-cut filter, or treble-cut filter in audio applications. A low-pass filter is
Low-pass_filter
Form of carbon with an extremely high surface area
carbon, also called activated charcoal, is a form of carbon commonly used to filter contaminants from water and air, among many other uses. It is processed
Activated_carbon
Type of electronic circuit or optical filter
A high-pass filter (HPF) is an electronic filter that passes signals with a frequency higher than a certain cutoff frequency and attenuates signals with
High-pass_filter
Removes diesel particulate matter or soot from the exhaust gas of a diesel engine
passively through the use of a catalyst or by active means such as a fuel burner which heats the filter to soot combustion temperatures. This is accomplished
Diesel_particulate_filter
Electronic filter circuits defined by component connection
Electronic filter topology defines electronic filter circuits without taking note of the values of the components used but only the manner in which those
Electronic_filter_topology
Electronic filter topology
The Sallen–Key topology is an electronic filter topology used to implement second-order active filters that is particularly valued for its simplicity
Sallen–Key_topology
Electrical power device
suppression. Active power filters (APF) are filters which can perform the job of harmonic elimination. Active power filters can be used to filter out harmonics
Power_conditioner
Type of electronic filter used in audio
originally described in Active Crossover Networks for Noncoincident Drivers. It is also known as a Butterworth squared filter. A Linkwitz–Riley crossover
Linkwitz–Riley_filter
Filter that has a linear response
Linear filters process time-varying input signals to produce output signals, subject to the constraint of linearity. In most cases these linear filters are
Linear_filter
Systems that do not produce or consume energy
especially filter design. A passive filter is a kind of electronic filter that is made only from passive components – in contrast to an active filter, it does
Passivity_(engineering)
Filter used in signal processing on continuous-time signals
An analogue filter is a basic building block of signal processing much used in electronics. Amongst their many applications are the separation of an audio
Analogue_filter
Largest living species of fish
(probably in Spain), in the Late Burdigalian stage. The whale shark is an active filter feeder, primarily consuming plankton, krill, fish eggs, and small schooling
Whale_shark
Type of signal processing filter
The Butterworth filter is a type of signal processing filter designed to have a frequency response that is as flat as possible in the passband. It is also
Butterworth_filter
use of active electronic components. Active EMI reduction contrasts with passive filtering techniques, such as RC filters, LC filters RLC filters, which
Active_EMI_reduction
Electronic filter circuitry used in loudspeakers
to operate within different frequency ranges. The crossover filters can be either active or passive. They are often described as two-way or three-way
Audio_crossover
Analog low-pass filter on communications networks
On All Phones. DSL filters are passive devices, requiring no power source to operate. Some high-quality filters may contain active transistors to refine
DSL_filter
Regulating device used on transmission networks
von Geymuller, Heinrich (2020-10-12). "STATCOM with Active Filter Using STATCOM as Active Filter, Improving Power Quality and reducing Harmonics". 2020
Static synchronous compensator
Static_synchronous_compensator
Study of mathematical algorithms for optimization problems
applications of optimization techniques in electrical engineering include active filter design, stray field reduction in superconducting magnetic energy storage
Mathematical_optimization
Device for suppressing part of a signal
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
Filter_(signal_processing)
Signal processing filter
An all-pass filter is a signal processing filter that passes all frequencies equally in gain, but changes the phase relationship among various frequencies
All-pass_filter
Chinese internet regulations
as Weibo, and others to actively censor their users. This results in private companies censoring their own platform for filtered content, forcing Chinese
Great_Firewall
Electronic filters designed by the network synthesis method
implementations in active filters and digital filters. The essence of the method is to obtain the component values of the filter from a given rational
Network_synthesis_filters
Type of analog or digital filter
Chebyshev filters are analog or digital filters that have a steeper roll-off than Butterworth filters, and have either passband ripple (type I) or stopband
Chebyshev_filter
Mathematical transformation reducing the damage caused by aliasing
An anti-aliasing filter (AAF) is a filter used before a signal sampler to restrict the bandwidth of a signal to satisfy the Nyquist–Shannon sampling theorem
Anti-aliasing_filter
Data structure for approximate set membership
In computing, a Bloom filter is a space-efficient probabilistic data structure, conceived by Burton Howard Bloom in 1970, that is used to test whether
Bloom_filter
ITU-T Recommendation
passive optics such as unpowered splitters and filters, offering high reliability and low cost compared to active networks. The PON data stream is generally
NG-PON2
Water filtration device
vessels to filter drinking water, wine and other liquids. A sand bed filter is a kind of depth filter. Broadly, there are two types of filters for separating
Sand_filter
Property that an increasing voltage results in a decreasing current
negative differential resistance. These are used in oscillators and active filters. Because they are nonlinear, negative resistance devices have a more
Negative_resistance
Type of active circuit electronic filter
leapfrog filter is a type of active circuit electronic filter that simulates a passive electronic ladder filter. Other names for this type of filter are active-ladder
Leapfrog_filter
Two-port non-reciprocal network element
behave like a parallel LC circuit, and so on. It is primarily used in active filter design and miniaturization. An ideal gyrator is a linear two-port device
Gyrator
Intellectual isolation through internet algorithms
A filter bubble is a state of intellectual isolation that arises when personalized searches, recommendation systems, and algorithmic curation selectively
Filter_bubble
Signal processing filter
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
Elliptic_filter
Topics referred to by the same term
Dwell time (filtration), the time a fluid remains in contact with an active filter medium. Dwell time (GNSS) Dwell time (information retrieval), the time
Dwell_time
Hypothesis of barriers to forming interstellar civilizations
The Great Filter is the idea that, in the development of life from the earliest stages of abiogenesis to reaching the highest levels of development on
Great_Filter
Chemical compound
most common use for Food Grade synthetic magnesium silicate is as an active filter aid for adsorption of color, free fatty acids and other polar compounds
Synthetic_magnesium_silicate
American rock band
Filter is an American rock band formed in 1993 in Cleveland, Ohio, by singer Richard Patrick, along with guitarist and programmer Brian Liesegang. The
Filter_(band)
Cassette deck manufactured from 1985–1990
stage—an active filter built around an operational amplifier in inverting configuration. Subtle phase control networks in the active filter were tuned
Revox_B215
Electrical device that uses batteries to prevent any interruption of power flow
when used in tandem with generators. An alternative solution is an active filter. Through the use of such a device, THDI can drop to 5% over the full
Uninterruptible_power_supply
Road design that restricts the passage of certain types of vehicle
A modal filter, sometimes referred to as a point closure, is a road design that restricts the passage of certain types of vehicle in road transport. Modal
Modal_filter
Fine-pored filter used for purifying water
ceramic filter cartridge that reduces organic and metallic contaminants. The active carbon absorbs compounds such as chlorine. Filters with active carbon
Ceramic_water_filter
General-interest community weblog
question-and-answer subsite Ask MetaFilter. The site has seven paid staff members as of August 2025. MetaFilter has about 47,691 active members as of May 2024. From
MetaFilter
Filter in electronics and signal processing
signal processing, mainly in digital signal processing, a Gaussian filter is a filter whose impulse response is a Gaussian function (or an approximation
Gaussian_filter
Web browser content blocking extension
(/ˈjuːblɒk/ YOO-blok) is a free and open-source browser extension for content filtering, including ad blocking. The extension is available for Firefox and Chromium-based
UBlock_Origin
High-gain voltage amplifier with a differential input
Frederick Driscoll; Prentice Hall; 529 pages; 2001; ISBN 978-0-13-014991-6. Active-Filter Cookbook; 2nd Ed; Don Lancaster; Sams; 240 pages; 1996; ISBN 978-0-7506-2986-7
Operational_amplifier
Filters which selectively transmit specific colors
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_filter
Type of Monte Carlo algorithms for signal processing and statistical inference
Particle filters, also known as sequential Monte Carlo methods, are a set of Monte Carlo algorithms used to find approximate solutions for filtering problems
Particle_filter
Field of electrical engineering
well as nonlinear ones. The former are, for instance, passive filters, active filters, additive mixers, integrators, and delay lines. Nonlinear circuits
Signal_processing
Process of listening to IGMP network traffic to control delivery of IP multicasts
suppression actively filters IGMP packets in order to reduce load on the multicast router. Joins and leaves heading upstream to the router are filtered so that
IGMP_snooping
South Korean rock band
Cherry Filter (체리 필터) is a South Korean rock band formed in 1997. Their unique sound - consisting of emotional ballads, punk rock, rave and trance - prevalent
Cherry_Filter
Optical band-pass filter used in the physical sciences
An atomic line filter (ALF) is a more effective optical band-pass filter used in the physical sciences for filtering electromagnetic radiation with precision
Atomic_line_filter
Written work by Paul Horowitz and Winfield Hill
circuit design, from basic DC voltage, current, and resistance, to active filters and oscillators, to digital electronics, including microprocessors and
The_Art_of_Electronics
Loudspeaker driver designed to produce low frequency sounds
midrange and high frequencies. A crossover network, either passive or active, filters the band of frequencies to be handled by the woofer and other speakers
Woofer
decade. The element is used in implementation of low-pass active filters modeled from ladder filters. The element is usually implemented from a generalized
Frequency-dependent negative resistor
Frequency-dependent_negative_resistor
Engineering process for electronic hardware
of op-amps, linear regulators, phase locked loops, oscillators and active filters. Analog design is more concerned with the physics of the semiconductor
Integrated_circuit_design
Method for reducing unwanted sound
Active noise control (ANC), also known as noise cancellation (NC), or active noise reduction (ANR), is a method for reducing unwanted sound by the addition
Active_noise_control
Manufacturing equipment
pharmaceutical or chemical process for an active pharmaceutical ingredient (API) or other compounds production. Filter dryers are designed for washing and isolating
Filter_dryer
Animals that feed by straining food from water
Filter feeders are aquatic animals that acquire nutrients by feeding on organic matter, food particles or smaller organisms (bacteria, microalgae and zooplanktons)
Filter_feeder
Pollution control device
A baghouse, also known as a baghouse filter, bag filter, or fabric filter is an air pollution control device and dust collector that removes particulates
Baghouse
Parameter of electronic amplifiers
consideration matters only with reactive and active feedback networks, as may be the case with active filters. Phase margin and its important companion concept
Phase_margin
Specification for the recording and playback of phonograph records
roll off at 49.9 kHz, implemented by a Butterworth (maximally flat) active filter, plus an additional pole at 482 kHz. This cannot be compensated for
RIAA_equalization
Algorithm used by recommender systems
Collaborative filtering (CF) is, besides content-based filtering, one of two major techniques used by recommender systems. Collaborative filtering has two senses
Collaborative_filtering
Computer program to process a stream
A filter is a computer program or subroutine to process a stream, producing another stream. While a single filter can be used individually, they are frequently
Filter_(software)
Electronic filter circuit controlled with voltage
Transistor ladder filter Diode ladder filter Sallen–Key filter OTA filter Audio filter Electronic filter Electronic filter topology Non-linear filter Self oscillation
Voltage-controlled_filter
Water filtration system in Warsaw, Poland
indirect ozoning and carbon active filters station were built. This consists of 3 ozone generators and 18 carbon filter chambers. Modern buildings have
Lindley_Filters
High end hifi cassette deck
channel – one each for forward and reverse. Each head amplifier is an active filter using a discrete JFET front stage that is AC-coupled to an operational
Nakamichi_Dragon
Power supply with switching regulator
Supplies—Reference Manual and Design Guide" (PDF). Retrieved 2011-11-17. "An active power filter implemented with multilevel single-phase NPC converters". 2011. Archived
Switched-mode_power_supply
German manufacturing company
is a family-owned manufacturer of liquid and air filter systems, intake systems and cabin air filters headquartered in Ludwigsburg, Baden-Württemberg,
Mann+Hummel
Defunct live-streaming platform
announced a deal with Fox to actively filter streams in real-time. Justin.tv used a filtering system from Vobile to detect and filter out any infringing content
Justin.tv
Random fluctuation in an electrical signal
(2006, Nov 14) Practical Electronics for Inventors. ed. McGraw-Hill. Active Filter (Sallen & Key) Noise Study. Archived 2015-05-22 at the Wayback Machine
Noise_(electronics)
Changing the balance of frequency components in an audio signal
this is called an equalizer. Most hi-fi equipment uses relatively simple filters to make bass and treble adjustments. Graphic and parametric equalizers
Audio_equalization
American writer and engineer (died 2023)
CMOS Cookbook (1ed, 1977) (4ed, 2019, ISBN 0-672-21398-2, archive) Active Filter Cookbook (1ed, 1975) (2ed, 1995, ISBN 0-75062986-X, archive) Project
Don_Lancaster
DC-coupled high-gain electronic voltage amplifier with differential inputs and outputs
are even capable of gain-bandwidth products greater than a gigahertz. Active filter Analog computer Current-feedback operational amplifier Instrumentation
Fully_differential_amplifier
Captures vibrations produced by musical instruments
greatly on the winding. "Active" pickups incorporate electronic circuitry to modify the signal. Active circuits can filter, attenuate, or boost the signal
Pickup_(music_technology)
Electronic device/component that increases the strength of a signal
the ability of the feedback loop to define the output is used to make active filter circuits. Another advantage of negative feedback is that it extends
Amplifier
Type of signal processing filter
lattice phase equaliser or lattice filter is an example of an all-pass filter. That is, the attenuation of the filter is constant at all frequencies but
Lattice_phase_equaliser
Optical device
available that can modulate amplitude, phase, or both simultaneously. Active filters in femtosecond pulse shaping Photoelastic modulator Waveplate Larry
Spatial_light_modulator
order to have an infinite pull-in(capture) range, an active filter must be used for the loop filter in CP-PLL (Fahim-Egan's conjecture on the pull-in range
Charge-pump_phase-locked_loop
Figure of merit for amplifiers
Srinivasan, S. (February 1977). "A universal compensation scheme for active filters". International Journal of Electronics. 42 (2): 141–151. Bibcode:1977IJE
Gain–bandwidth_product
Class of marine animals in the subphylum Tunicata
free-swimming tunicates found throughout the world's oceans. While larvaceans are filter feeders like most other tunicates, they keep their tadpole-like shape as
Larvacean
Software or hardware-based network security system
used in the 1980s. Because they already segregated networks, routers could filter packets crossing them. Before it was used in real-life computing, the term
Firewall_(computing)
filter topology with little concern for the loading effects of stages in the filter or of subsequent stages. However, the frequencies at which active
Operational amplifier applications
Operational_amplifier_applications
British company specializing in audio equipment
Research into amplifiers and active filters leads to the Active One loudspeaker, branded under the name of John Bowers Active One in 1984. In the 1980s,
Bowers_&_Wilkins
Type of signal processing filter
A mechanical filter is a signal processing filter usually used in place of an electronic filter at radio frequencies. Its purpose is the same as that of
Mechanical_filter
information filtering takes the form of user-preferences-based newsfeeds, etc. Recommender systems and content discovery platforms are active information
Information_filtering_system
Device storing number of times an event or process occurred
increasing resistance accuracy; and by adding a capacitor or active filter to low-pass filter the edges of voltage steps. Stepped sinusoidal waveform using
Counter_(digital)
Gay cruising web app
does not require registration to use; however, certain features, such as filtering results, require free registration. Sniffies Plus, a paid subscription
Sniffies
Technique of both listening to what is said and replying with an accurate summary
Active listening is the act of intentionally engaging with communication. Speakers receive confirmation that their point is coming across and listeners
Active_listening
American automotive filter manufacturer
MANN+HUMMEL Purolator Filters LLC, more commonly known as Purolator, is an American manufacturer of oil and air filters, based in Fayetteville, North
Purolator_Filters
Electronic circuit formed on a small, flat piece of semiconductor material
continuous signals, and perform analog functions such as amplification, active filtering, demodulation, and mixing. ICs can combine analog and digital circuits
Integrated_circuit
Signal processing technique to reduce noise
interference, through a filter that is designed to minimise the effect of the interference. The objective of optimal filtering is to maximise the signal-to-noise
Adaptive_noise_cancelling
Type of substation
overhead line will run through populated areas. These filters can be passive LC filters or active filters, consisting of an amplifier coupled through transformers
HVDC_converter_station
BYU in September 2017. Comer's areas of interest include passive and active filter design, MOS amplifier design, wideband amplifier design, operation of
David_Comer
Underwater acoustic signal processing
implementing FIR filters. Second, for an IIR filter, linear phase is always difficult to obtain, so FIR filter is stable as opposed to an IIR filter. What’s more
Sonar_signal_processing
Type of adjustable-speed drive
input to the inverter. This filtered DC voltage is converted to quasi-sinusoidal AC voltage output using the inverter's active switching elements. VSI drives
Variable-frequency_drive
Extinct genus of crinoids
"Microscopic interpinnular channels" suggest that Encrinus may have been an active filter feeder, creating its own currents by beating its cilia. It is known
Encrinus
ACTIVE FILTER
ACTIVE FILTER
Male
English
English pet form of Celtic Arthur, possibly ARTIE means "bear-man."Â
Girl/Female
Greek
Active.
Boy/Male
French American
Born eighth.
Boy/Male
Muslim
Active
Girl/Female
German
Active.
Boy/Male
Polish
Active.
Boy/Male
English
Active.
Male
English
English surname transferred to forename use, from the name of various places, derived from Old English clif, CLIVE means "bank, cliff, slope."
Girl/Female
German
Active.
Boy/Male
English
Active.
Girl/Female
Hindi
Active.
Male
English
Pet form of English Ace, ACIE means "number one."
Boy/Male
English
Active.
Girl/Female
German
Active.
Boy/Male
British, English, Indian, Russian
Work
Surname or Lastname
English
English : habitational name from any of various places, for example in Shropshire and Cheshire, named Clive, from the dative case of Old English clif ‘slope’, ‘bank’, ‘cliff’ (see Cliff), originally used after a preposition. In some cases the name may be topographical, with the same origin and meaning.
Boy/Male
Teutonic American English
Active.
Girl/Female
Greek
Active.
Boy/Male
Indian
Active
Girl/Female
Slavic
Active.
ACTIVE FILTER
ACTIVE FILTER
Boy/Male
American, Arabic, Australian, British, Chinese, Christian, English, Muslim
Happy; Battle; Short Form of the Biblical Shadrach
Surname or Lastname
English
English : variant spelling of Horsman.
Surname or Lastname
English
English : variant of Whorley.
Boy/Male
Tamil
Rakthakamal | ரகà¯à®¤à®•à®®à®³
Red lotus
Girl/Female
Indian
Beautiful women, Flower, Beautiful women, Flower
Girl/Female
Australian, Hawaiian, Hebrew
Healed by God; Healer
Girl/Female
Bengali, Hindu, Indian
Gift of God; Divine
Girl/Female
Hindu, Indian, Marathi, Sanskrit, Tamil
Luminous; Shining Forth
Boy/Male
Hindu, Indian
God's Pet
Boy/Male
Hindu
The king of birds, Falcon
ACTIVE FILTER
ACTIVE FILTER
ACTIVE FILTER
ACTIVE FILTER
ACTIVE FILTER
a.
Acting in concurrence; united in action.
a.
Given to action rather than contemplation; practical; operative; -- opposed to speculative or theoretical; as, an active rather than a speculative statesman.
n.
Any one of the active processes going on in an organism; the performance of a function; as, the action of the heart, the muscles, or the gastric juice.
a.
Not disposed to action or effort; not diligent or industrious; not busy; idle; as, an inactive officer.
a.
Given to action; constantly engaged in action; energetic; diligent; busy; -- opposed to dull, sluggish, indolent, or inert; as, an active man of business; active mind; active zeal.
a.
Doing; active.
a.
Brisk; lively; as, an active demand for corn.
a.
Not active; inert; esp., not exhibiting any action or activity on polarized light; optically neutral; -- said of isomeric forms of certain substances, in distinction from other forms which are optically active; as, racemic acid is an inactive tartaric acid.
a.
Having the power or quality of acting; causing change; communicating action or motion; acting; -- opposed to passive, that receives; as, certain active principles; the powers of the mind.
a.
Quick in physical movement; of an agile and vigorous body; nimble; as, an active child or animal.
a.
Implying or producing rapid action; as, an active disease; an active remedy.
a.
Requiring or implying action or exertion; -- opposed to sedentary or to tranquil; as, active employment or service; active scenes.
v. t.
To make active.
a.
Applied to a form of the verb; -- opposed to passive. See Active voice, under Voice.
a.
Not active; having no power to move; that does not or can not produce results; inert; as, matter is, of itself, inactive.
a.
Applied to all verbs that express action as distinct from mere existence or state.
a.
In action; actually proceeding; working; in force; -- opposed to quiescent, dormant, or extinct; as, active laws; active hostilities; an active volcano.
adv.
In an active manner; nimbly; briskly; energetically; also, by one's own action; voluntarily, not passively.
n.
Action.
adv.
In an active signification; as, a word used actively.