Filter theory Filter theory An analog filter handles analog signals, whether electric potential, sound waves, or mechanical motion directly. The design of mechanical or acoustic filters is based on similar principles to electronic linear filters. ...more on Wikipedia about "Analog filter"
An audio filter is a type of filter used for processing sound signals. Many types of filters exist for applications including graphic equalizers, synthesizers, sound effects, CD players and virtual reality systems. ...more on Wikipedia about "Audio filter"
Band rejection is a phenomenon in waveform signals, where a certain frequency or range of frequencies are lost or removed from a source signal. ...more on Wikipedia about "Band rejection"
Bandwidth is a measure of frequency range, measured in hertz, of a function of a frequency variable. ...more on Wikipedia about "Bandwidth"
In electronics, a digital filter is any electronic filter that works by performing digital math operations on an intermediate form of a signal. This is in contrast with older analog filters which work entirely in the analog realm and must rely on physical networks of electronic components (such as resistors, capacitors, transistors, etc.) to achieve a desired filtering effect. ...more on Wikipedia about "Digital filter"
Electronic filters are electronic circuits which perform signal processing functions. Electronic filters can be: ...more on Wikipedia about "Electronic filter"
The design of a frequency domain filter must begin by deciding what kind of filter is required for the task at hand. ...more on Wikipedia about "Filter design"
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A finite impulse response (FIR) filter is a type of a digital filter. It is 'finite' because its response to an impulse ultimately settles to zero. This is in contrast to infinite impulse response filters which have internal feedback & may continue responding indefinitely. ...more on Wikipedia about "Finite impulse response"
A Gabor filter is a linear filter whose impulse response is defined by a harmonic function multiplied by a Gaussian function. Because of the multiplication-convolution property, the Fourier transform of a Gabor filter's impulse response is the convolution of the Fourier transform of the harmonic function and the Fourier transform of the Gaussian function. ...more on Wikipedia about "Gabor filter"
IIR (infinite impulse response) filters have an impulse response function which is non-zero over an infinite length of time. This is in contrast to finite impulse response filters (FIR) which have fixed-duration impulse responses. The simplest analog IIR filter is an RC filter made up of a single resistor (R) feeding into a node shared with a single capacitor (C). This filter has an exponential impulse response characterized by an RC time constant. ...more on Wikipedia about "Infinite impulse response"
In telecommunications, optics, and acoustics, passband is the portion of spectrum, between limiting frequencies (or, in the optical regime, limiting wavelengths), that is transmitted with minimum relative loss or maximum relative gain by a filtering device. ...more on Wikipedia about "Passband"
A stopband is a band of frequencies, between specified limits, that a circuit, such as a filter or telephone circuit, does not let signals through. ...more on Wikipedia about "Stopband"
Yttrium iron garnet filter (YIG filter, YIGF) is a tunable electronic filter for microwave frequencies. It typically has a high Q factor. ...more on Wikipedia about "Yttrium iron garnet filter"
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