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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
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
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
Filter that rejects signals outside a certain range
A band-pass filter or bandpass filter (BPF) is a device that passes frequencies within a certain range and attenuates frequencies outside that range. It
Band-pass_filter
Electronic device
integrator-comb filter Comb filter DSL filter Electronic low-pass filter Nyquist filter RF and microwave filter Switched-capacitor filter Tone control circuits
Electronic_filter
Electronic filter circuits defined by component connection
linear filter transfer function are; high-pass, low-pass, bandpass, band-reject or notch and all-pass. Once the transfer function for a filter is chosen
Electronic_filter_topology
Type of electronic filter used in audio
Butterworth squared filter. A Linkwitz–Riley crossover consists of a parallel combination of a low-pass and a high-pass L-R filter. These filters are typically
Linkwitz–Riley_filter
Wavelength-selective optical filter
others, with almost no absorption for all wavelengths of interest. An interference filter may be high-pass, low-pass, bandpass, or band-rejection. They are
Interference_filter
Filter that has a linear response
notch filter has a null response at a particular frequency. This function may be combined with one of the above responses. An all-pass filter passes all frequencies
Linear_filter
Type of signal processing filter
low-pass filter could be modified to give low-pass, high-pass, band-pass and band-stop functionality. The frequency response of the Butterworth filter is
Butterworth_filter
Type of analog linear filter in electronics
wave shape of filtered signals in the passband. Bessel high-pass and low-pass filters are often used in audio crossover systems. The filter's name is a reference
Bessel_filter
Frequency dependent circuit
frequencies while passing those outside the 'reject' range. All-pass An all-pass filter passes all frequencies but affects the phase of any given sinusoidal
Audio_filter
Filter that rejects signals inside a certain range
In signal processing, a band-stop filter or band-rejection filter is a filter that passes most frequencies unaltered, but attenuates those in a specific
Band-stop_filter
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
Device for suppressing part of a signal
comb. All-pass filter – all frequencies are passed, but the phase of the output is modified. Cutoff frequency is the frequency beyond which the filter will
Filter_(signal_processing)
Mathematical transformation reducing the damage caused by aliasing
digital cameras, the anti-aliasing filter is also known as an optical low-pass filter (OLPF), blur filter, or AA filter. The mathematics of sampling in two
Anti-aliasing_filter
Signal processing design process
below a certain range. A very narrow band-stop filter is known as a notch filter. An all-pass filter passes all frequencies equally in gain. Only the phase
Filter_design
Process that separates solids from fluids
using a filter medium that has a complex structure through which only the fluid can pass. Solid particles that cannot pass through the filter medium are
Filtration
Ideal low-pass filter or averaging filter
as a "brick-wall filter" (in reference to the shape of the transfer function). The sinc-in-time filter is a brick-wall low-pass filter, from which brick-wall
Sinc_filter
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
Sweeping audio effect
an audio signal into two paths. One path treats the signal with an all-pass filter, which preserves the amplitude of the original signal and alters the
Phaser_(effect)
Type of variable active electronic filter
highpass output. Further, an all-pass filter can be build, again with an OpAmp, by subtracting the bandpass output from the filter input. The signal input
State_variable_filter
Signal processing technique
an all-pass filter in series with an uncompensated filter. Clever machine-learning techniques are now being applied to the design of such filters. Quélhas
Delay_equalization
Analog low-pass filter on communications networks
A DSL filter (also DSL splitter or microfilter) is an analog low-pass filter installed between analog devices (such as telephones or analog modems) and
DSL_filter
is an electrical all-pass filter circuit utilising bridged-T topology whose purpose is to insert an (ideally) constant delay at all frequencies in the
Bridged_T_delay_equaliser
Electric circuit composed of resistors and capacitors
to filter a signal by blocking certain frequencies and passing others. The two most common RC filters are the high-pass filters and low-pass filters; band-pass
RC_circuit
Type of analog or digital filter
frequency ω {\displaystyle \omega } of the n {\displaystyle n} th-order low-pass filter is equal to the absolute value of the transfer function H n ( s ) {\displaystyle
Chebyshev_filter
Topics referred to by the same term
Look up Filter, filter, filtering, or filters in Wiktionary, the free dictionary. Filter, filtering, filters or filtration may also refer to: Filter (higher-order
Filter
Type of signal processing filter
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 the relative
Lattice_phase_equaliser
Electronic filter that is constructed with waveguide technology
transmitted. Filters are devices used to allow signals at some frequencies to pass (the passband), while others are rejected (the stopband). Filters are a basic
Waveguide_filter
Filters which selectively transmit specific colors
Optical filters selectively transmit light in a particular range of wavelengths, that is, colours, while absorbing the remainder. They can usually pass long
Optical_filter
Resistor Inductor Capacitor Circuit
band-pass filter, band-stop filter, low-pass filter or high-pass filter. The tuning application, for instance, is an example of band-pass filtering. The
RLC_circuit
Electronic filter topology
output impedance to implement a 2-pole low-pass, high-pass, bandpass, bandstop, or allpass response. The VCVS filter allows high Q factor and passband gain
Sallen–Key_topology
Lens filter for cameras
A polarizing filter or polarising filter (see spelling differences) is a filter that is often placed in front of a camera lens in photography in order
Polarizing filter (photography)
Polarizing_filter_(photography)
Electronic filters designed by the network synthesis method
produce filters of the kind formerly described as wave filters but now usually just called filters. That is, filters whose purpose is to pass waves of
Network_synthesis_filters
Analog circuit which filters an electronic signal using an amplifier
those they allow to pass. Band-stop filter (Notch filter) – attenuation of certain frequencies while allowing all others to pass. Combinations are possible
Active_filter
Feature of filter frequency response
bandform of the filter being considered: for instance a low-pass filter will roll-off with increasing frequency, but a high-pass filter or the lower stopband
Roll-off
Camera accessory consisting of an optical filter
they pass; green and infrared filters pass their named colors, but a UV filter blocks UV.) It can be left on the lens for nearly all shots: UV filters are
Photographic_filter
Changing the balance of frequency components in an audio signal
featured two passive equalization sections, a bass shelving filter, and a pass band filter. Each filter had switchable frequencies and used a 15-position slide
Audio_equalization
mm'-type filters, also called double-m-derived filters, are a type of electronic filter designed using the image method. They were patented by Otto Zobel
Mm'-type_filter
Two-port electrical wave filter
in many applications. Lattice phase equalizer All-pass filter Two-port network Composite image filter Lattice delay network Ladder network Weinberg L
Lattice_network
Type of electronic filter circuit
are in conventional filters. Its purpose is to allow a range of signal frequencies to pass, but to block others. Conventional filters are constructed from
Distributed-element_filter
Multimedia framework
the following filters. Resampling (aresample) Pass/Stop filters Low-pass filter (lowpass) High-pass filter (highpass) All-pass filter (allpass) Butterworth
FFmpeg
Form of waveform distortion
overheating. Clipping can occur within a system as processing (e.g., an all-pass filter) can change the phase relationship between spectral components of a
Clipping_(audio)
be implemented using a cascade of all-pass filters, with a one-pole lowpass filter at each tap between the all-pass sections.[citation needed] Given a
Kautz_filter
Type of electronic filter designed using the image method
this term later came to mean any filter that passes waves of some frequencies but not others. Many new forms of wave filter were subsequently invented; an
Constant_k_filter
Algorithm that estimates unknowns from a series of measurements over time
In statistics and control theory, Kalman filtering (also known as linear quadratic estimation) is an algorithm that uses a series of measurements observed
Kalman_filter
Type of filter in signal processing
For the wave filter invented by Zobel and sometimes named after him see m-derived filters. Zobel networks are a type of filter section based on the image-impedance
Zobel_network
Audio effect
delay line (or simply delay line, also called delay filter) is a discrete element in a digital filter that allows a signal to be delayed by a number of
Digital_delay_line
Optical filters that block near-infrared while passing visible light
filters, photographic filters are named for the color of light they pass. Thus a blue filter makes the picture look blue. A blue filter marginally allows
Infrared_cut-off_filter
Signal processing operation
first order all-pass filters. The transform preserves stability and maps every point of the frequency response of the continuous-time filter, H a ( j ω
Bilinear_transform
Removes diesel particulate matter or soot from the exhaust gas of a diesel engine
oxidise or burn larger particles until they are small enough to pass through the filter, though often particles "clump" together in the DPF reducing the
Diesel_particulate_filter
Type of electronic filter
type filter. The main problem being addressed was the need to achieve a better match of the filter into the terminating impedances. In general, all filters
M-derived_filter
In signal processing, a washout filter is a stable high pass filter with zero static gain. This leads to the filtering of lower frequency inputs signals
Washout_filter
Device for suppressing part of a discretely-sampled signal
Bessel filter Bilinear transform Butterworth filter Chebyshev filter Electronic filter Elliptical filter (Cauer filter) Filter design High-pass filter, Low-pass
Digital_filter
Cheaper decks may have MPX filtering performed by a low-pass filter that rolls off everything above 15 kHz. A proper MPX filter for quality recording is
MPX_filter
Signal processing method
indirect method for finding the optimal filter coefficients. The goal of the algorithm is to minimize the error in the pass and stop bands by utilizing the Chebyshev
Parks–McClellan filter design algorithm
Parks–McClellan_filter_design_algorithm
the mixture to be filtered can pass through the filter cake, and the filter becomes plugged or clogged. The specifications of the filter cake dictate the
Filter_cake
Band of audio frequencies that produce the effect of auditory masking in the human ear
modeled as being an array of overlapping band-pass filters known as "auditory filters". The auditory filters are associated with points along the basilar
Critical_band
Algorithm to smooth data points
A Savitzky–Golay filter is a digital filter that can be applied to a set of digital data points for the purpose of smoothing the data, that is, to increase
Savitzky–Golay_filter
Delay-based audio effects system
whereas, if the coefficients are set to be equal, we approximate an all-pass filter. All the effects can be obtained by changing the parameters of the Dattorro
Dattorro_industry_scheme
Filter used in signal processing on continuous-time signals
the filters described in this article. Analogue filters are most often used in wave filtering applications, that is, where it is required to pass particular
Analogue_filter
Frequencies or wavelengths that can pass through a filter
can pass through a filter. For example, a radio receiver contains a bandpass filter to select the frequency of the desired radio signal out of all the
Passband
Telescope accessory used to improve details of viewed objects
astrophotography. Research astronomers, on the other hand, use various band-pass filters for photometry on telescopes, in order to obtain measurements which reveal
Astronomical_filter
Linear predictive coding
replacing the unit delays used in an LPC implementation with first-order all-pass filters. This can have advantages in reducing the bitrate required for a given
Warped linear predictive coding
Warped_linear_predictive_coding
Electronic filter
composite image filter is an electronic filter consisting of multiple image filter sections of two or more different types. The image method of filter design determines
Composite_image_filter
Topics referred to by the same term
HP filter may refer to: Hodrick–Prescott filter, a mathematical tool used in macroeconomics High-pass filter, an electronic filter HEPA filter This disambiguation
HP_filter
Coffee brewing utensil
A coffee filter is a filter used for various coffee brewing methods including but not limited to drip coffee filtering. Filters made of paper (disposable)
Coffee_filter
Lattice network
are all-pass filters, so they have a flat amplitude response, but a phase response which varies linearly (or almost linearly) with frequency. All lattice
Lattice_delay_network
In control theory, when an LTI system and its inverse are causal and stable
linear phase or nearly linear phase systems are also mixed phase. All-pass filter – A special non-minimum-phase case. Kramers–Kronig relation – Minimum
Minimum_phase
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
Form of error in digital signals; spurious signals near sharp transitions
(specifically, not having high frequencies) or passed through a low-pass filter; this is the frequency domain description. In terms of the time domain
Ringing_artifacts
Electrical circuit with equal-length transmission lines
the Bessel filter, but they only work within a prescribed passband, even with ideal components. Alternatively, lumped-element all-pass filters can be constructed
Commensurate_line_circuit
Non-linear digital filtering technique to remove noise
must include all entries within a given radius or ellipsoidal or rectangular region (i.e., the median filter is not a separable filter).[citation needed]
Median_filter
Type of filter used in image processing
smoothing are linear low-pass filters that effectively reduce noise but also blur out the edges. However the Kuwahara filter is able to apply smoothing
Kuwahara_filter
Optical filter device
optical filter that lets light waves of a specific polarization pass through while blocking light waves of other polarizations. It can filter a beam of
Polarizer
Efficiency standard of air filters
efficiency. Common standards require that a HEPA air filter must remove—from the air that passes through—at least 99.95% (ISO, European Standard) or 99
HEPA
Resistive and inductive circuit
A resistor–inductor circuit (RL circuit), or RL filter or RL network, is an electric circuit composed of resistors and inductors driven by a voltage or
RL_circuit
taken from a low-pass filter, commonly used in audio systems to allow the bass signal to pass through to a subwoofer, and cut out all unwanted frequencies
Transition_band
Processing of email to organize it according to specified criteria
filter types. Corporations often use filters to protect their employees and their information technology assets. A catch-all filter will "catch all"
Email_filtering
Artificially created or enhanced sound
signal is split, a portion is filtered with an all-pass filter to produce a phase-shift, and then the unfiltered and filtered signals are mixed. The phaser
Sound_effect
Statistical filter
where m is a positive, odd integer. The KZ filter belongs to the class of low-pass filters. The KZ filter has two parameters, the length m of the moving
Kolmogorov–Zurbenko_filter
Second order recursive digital linear filter
digital biquad filter is a second order recursive linear filter, containing two poles and two zeros, which implements the analog biquad filter topology in
Digital_biquad_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
Electrical resonant circuit
LC circuit, when connected in series with a load, will act as a band-pass filter having zero impedance at the resonant frequency of the LC circuit. When
LC_circuit
Color filter array
A Bayer filter mosaic is a color filter array (CFA) for arranging RGB color filters on a square grid of photosensors. Its particular arrangement of color
Bayer_filter
Surname list
(1906–1999), English cricketer Joseph Alpass (1873–1969), British politician All-pass filter Eric Allpass (1889–1977), Australian politician This page lists people
Alpass
Type of wastewater treatment system with a fixed bed of rocks or similar
many trickling filters in parallel. Systems can be configured for single-pass use where the treated water is applied to the trickling filter once before
Trickling_filter
American optical engineer
her development of coupled multiple ring resonator filters and multistage optical all-pass filters. Madsen majored in electrical engineering at the University
Christi_Madsen
Digital signal sample rate converter
class of low-pass finite impulse response (FIR) filter that chains N number of integrator and comb filter pairs (where N is the filter's order) to form
Cascaded integrator–comb filter
Cascaded_integrator–comb_filter
Type of signal processing filter
same as that of a normal electronic filter: to pass a range of signal frequencies, but to block others. The filter acts on mechanical vibrations which
Mechanical_filter
results of applying the homomorphic filter, high-pass filter, and the both homomorphic and high-pass filter. All figures were produced using Matlab. According
Homomorphic_filtering
Property of many linear time-invariant (LTI) systems
all analog electronic filters are IIR, digital filters may be either IIR or FIR. The presence of feedback in the topology of a discrete-time filter (such
Infinite_impulse_response
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)
Template for electronic filter design
filter, but it cannot be transformed into a third-order Bessel filter or a fifth-order Chebyshev filter. A passive lumped low-pass prototype filter of
Prototype_filter
Class of electronic filter
Low-pass filter: allow only frequencies below a cutoff frequency to pass High-pass filter: allow only frequencies above a cutoff frequency to pass In general
RF_and_microwave_filter
filter is a common image processing filter that uses the Fermi–Dirac distribution in the frequency domain to perform a low-pass filter or high-pass filter
Fermi_filter
Frequency response boundary
points, while a low-pass amplifier or a high-pass amplifier will have only one. The bandwidth of a filter or amplifier is usually defined as the difference
Cutoff_frequency
Audio effect
phase-shifting, or "phasing". In phasing, the signal is passed through one or more all-pass filters with non-linear phase response and then added back to
Flanging
Type of image blur produced by a Gaussian function
components; a Gaussian blur is thus a low-pass filter. The Gaussian blur is a type of image-blurring filter that uses a Gaussian function (which also
Gaussian_blur
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