65 relations: Active filter, All-pass filter, Analogue filter, Atomic clock, Attenuation, Audio crossover, Audio filter, Band-pass filter, Band-stop filter, Broadband filter, Capacitor, Cascaded integrator–comb filter, Comb filter, Composite image filter, Constant k filter, Crystal filter, Datasheet, Digital filter, Discrete time and continuous time, DSL filter, Electrical reactance, Electrical resonance, Electronic filter topology, Filter (signal processing), Finite impulse response, George Ashley Campbell, Hertz, High-pass filter, Hybrid LC Filter, Image impedance, Inductor, Infinite impulse response, Kirchhoff's circuit laws, LC circuit, Linear filter, Low-pass filter, M-derived filter, Mechanical filter, Network synthesis filters, Nonlinear filter, Nyquist filter, Operational amplifier, Otto Julius Zobel, Passivity (engineering), Q factor, Rational function, RC circuit, Resistor, RF and microwave filter, RL circuit, ..., Sallen–Key topology, Signal processing, State variable filter, Stub (electronics), Surface acoustic wave, Switched capacitor, Tone control circuit, Transfer function, Transition band, Transmission line, Voltage-controlled filter, Wilhelm Cauer, World War II, YIG sphere, Zeros and poles. Expand index (15 more) »

## Active filter

An active filter is a type of analog circuit implementing an electronic filter using active components, typically an amplifier.

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## All-pass 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.

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## Analogue filter

Analogue filters are a basic building block of signal processing much used in electronics.

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## Atomic clock

An atomic clock is a clock device that uses an electron transition frequency in the microwave, optical, or ultraviolet region of the electromagnetic spectrum of atoms as a frequency standard for its timekeeping element.

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## Attenuation

In physics, attenuation or, in some contexts, extinction is the gradual loss of flux intensity through a medium.

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## Audio crossover

Audio crossovers are a type of electronic filter circuitry used in a range of audio applications, to split up an audio signal into two or more frequency ranges, so that the signals can be sent to drivers that are designed for different frequency ranges.

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## Audio filter

An audio filter is a frequency dependent amplifier circuit, working in the audio frequency range, 0 Hz to beyond 20 kHz.

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## Band-pass filter

A band-pass filter, also bandpass filter or BPF, is a device that passes frequencies within a certain range and rejects (attenuates) frequencies outside that range.

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## Band-stop filter

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 range to very low levels.

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## Broadband filter

*In telephony, where the same telephone connection is being used to carry telephone conversations and broadband internet access, a broadband filter is a device interposed in a joint in a telephone connection to stop internet traffic signals from reaching the telephone and thus causing loud interference noises spoiling the telephone conversation.

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## Capacitor

A capacitor is a passive two-terminal electrical component that stores potential energy in an electric field.

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## Cascaded integrator–comb filter

In digital signal processing, a cascaded integrator–comb (CIC) is an optimized class of finite impulse response (FIR) filter combined with an interpolator or decimator.

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## Comb filter

In signal processing, a comb filter is a filter implemented by adding a delayed version of a signal to itself, causing constructive and destructive interference.

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## Composite image filter

A composite image filter is an electronic filter consisting of multiple image filter sections of two or more different types.

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## Constant k filter

Constant k filters, also k-type filters, are a type of electronic filter designed using the image method.

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## Crystal filter

A crystal filter is an electronic filter that uses quartz crystals for resonators.

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## Datasheet

A floppy disk controller datasheet. A datasheet, data sheet, or spec sheet is a document that summarizes the performance and other technical characteristics of a product, machine, component (e.g., an electronic component), material, a subsystem (e.g., a power supply) or software in sufficient detail to be used by a design engineer to integrate the component into a system.

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## Digital filter

In signal processing, a digital filter is a system that performs mathematical operations on a sampled, discrete-time signal to reduce or enhance certain aspects of that signal.

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## Discrete time and continuous time

In mathematics and in particular mathematical dynamics, discrete time and continuous time are two alternative frameworks within which to model variables that evolve over time.

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## DSL filter

A DSL filter or microfilter is an analog low-pass filter installed between analog devices (such as telephones or analog modems) and a plain old telephone service (POTS) line.

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## Electrical reactance

In electrical and electronic systems, reactance is the opposition of a circuit element to a change in current or voltage, due to that element's inductance or capacitance.

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## Electrical resonance

Electrical resonance occurs in an electric circuit at a particular resonant frequency when the imaginary parts of impedances or admittances of circuit elements cancel each other.

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## Electronic filter topology

Electronic filter topology defines electronic filter circuits without taking note of the values of the components used but only the manner in which those components are connected.

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## Filter (signal processing)

In signal processing, a filter is a device or process that removes some unwanted components or features from a signal.

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## Finite impulse response

In signal processing, a finite impulse response (FIR) filter is a filter whose impulse response (or response to any finite length input) is of finite duration, because it settles to zero in finite time.

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## George Ashley Campbell

George Ashley Campbell (November 27, 1870 – November 10, 1954) was an American engineer.

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## Hertz

The hertz (symbol: Hz) is the derived unit of frequency in the International System of Units (SI) and is defined as one cycle per second.

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## High-pass 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 frequencies lower than the cutoff frequency.

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## Hybrid LC Filter

Hybrid LC filter is a kind of electrical LC filter, which typically contains two conductive foil layers, separated by an insulation material and coiled on a core.

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## Image impedance

Image impedance is a concept used in electronic network design and analysis and most especially in filter design.

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## Inductor

An inductor, also called a coil, choke or reactor, is a passive two-terminal electrical component that stores energy in a magnetic field when electric current flows through it.

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## Infinite impulse response

Infinite impulse response (IIR) is a property applying to many linear time-invariant systems.

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## Kirchhoff's circuit laws

Kirchhoff's circuit laws are two equalities that deal with the current and potential difference (commonly known as voltage) in the lumped element model of electrical circuits.

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## LC circuit

An LC circuit, also called a resonant circuit, tank circuit, or tuned circuit, is an electric circuit consisting of an inductor, represented by the letter L, and a capacitor, represented by the letter C, connected together.

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## Linear filter

Linear filters process time-varying input signals to produce output signals, subject to the constraint of linearity.

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## Low-pass filter

A low-pass filter (LPF) is a filter that passes signals with a frequency lower than a certain cutoff frequency and attenuates signals with frequencies higher than the cutoff frequency.

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## M-derived filter

m-derived filters or m-type filters are a type of electronic filter designed using the image method.

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## Mechanical filter

A mechanical filter is a signal processing filter usually used in place of an electronic filter at radio frequencies.

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## Network synthesis filters

Network synthesis is a method of designing signal processing filters.

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## Nonlinear filter

In signal processing, a nonlinear (or non-linear) filter is a filter whose output is not a linear function of its input.

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## Nyquist filter

A Nyquist filter is an electronic filter used in TV receivers to equalize the video characteristics.

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## Operational amplifier

An operational amplifier (often op-amp or opamp) is a DC-coupled high-gain electronic voltage amplifier with a differential input and, usually, a single-ended output.

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## Otto Julius Zobel

Otto Julius Zobel (October 20, 1887 – January 1970) was an electrical engineer who worked for the American Telephone & Telegraph Company (AT&T) in the early part of the 20th century.

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## Passivity (engineering)

Passivity is a property of engineering systems, used in a variety of engineering disciplines, but most commonly found in analog electronics and control systems.

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## Q factor

In physics and engineering the quality factor or Q factor is a dimensionless parameter that describes how underdamped an oscillator or resonator is, and characterizes a resonator's bandwidth relative to its centre frequency.

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## Rational function

In mathematics, a rational function is any function which can be defined by a rational fraction, i.e. an algebraic fraction such that both the numerator and the denominator are polynomials.

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## RC circuit

A resistor–capacitor circuit (RC circuit), or RC filter or RC network, is an electric circuit composed of resistors and capacitors driven by a voltage or current source.

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## Resistor

A resistor is a passive two-terminal electrical component that implements electrical resistance as a circuit element.

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## RF and microwave filter

Radio frequency (RF) and microwave filters represent a class of electronic filter, designed to operate on signals in the megahertz to gigahertz frequency ranges (medium frequency to extremely high frequency).

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## RL 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 current source.

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## Sallen–Key topology

The Sallen–Key topology is an electronic filter topology used to implement second-order active filters that is particularly valued for its simplicity.

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## Signal processing

Signal processing concerns the analysis, synthesis, and modification of signals, which are broadly defined as functions conveying "information about the behavior or attributes of some phenomenon", such as sound, images, and biological measurements.

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## State variable filter

A state variable filter is a type of active filter.

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## Stub (electronics)

In microwave and radio-frequency engineering, a stub or resonant stub is a length of transmission line or waveguide that is connected at one end only.

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## Surface acoustic wave

A surface acoustic wave (SAW) is an acoustic wave traveling along the surface of a material exhibiting elasticity, with an amplitude that typically decays exponentially with depth into the substrate.

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## Switched capacitor

A switched capacitor is an electronic circuit element used for discrete-time signal processing.

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## Tone control circuit

Tone control is a type of equalization used to make specific pitches or "frequencies" in an audio signal softer or louder.

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## Transfer function

In engineering, a transfer function (also known as system function or network function) of an electronic or control system component is a mathematical function giving the corresponding output value for each possible value of the input to the device.

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## Transition band

The transition band, also called the skirt, is a range of frequencies that allows a transition between a passband and a stopband of a signal processing filter.

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## Transmission line

In communications and electronic engineering, a transmission line is a specialized cable or other structure designed to conduct alternating current of radio frequency, that is, currents with a frequency high enough that their wave nature must be taken into account.

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## Voltage-controlled filter

A voltage-controlled filter (VCF) is a processor, a filter whose operating characteristics (primarily cutoff frequency) can be controlled by means of a control voltage applied to control inputs.

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## Wilhelm Cauer

Wilhelm Cauer (24 June 1900 – 22 April 1945) was a German mathematician and scientist.

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## World War II

World War II (often abbreviated to WWII or WW2), also known as the Second World War, was a global war that lasted from 1939 to 1945, although conflicts reflecting the ideological clash between what would become the Allied and Axis blocs began earlier.

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## YIG sphere

Yttrium iron garnet spheres (YIG spheres) serve as magnetically tunable filters and resonators for microwave frequencies.

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## Zeros and poles

In mathematics, a zero of a function is a value such that.

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## Redirects here:

BAW filter, Electronic filters, Filter (circuits), Frequency filter, Pi Filter, Pi filter, SAW filter.

## References

[1] https://en.wikipedia.org/wiki/Electronic_filter