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Что (кто) такое spectral redundance - определение
COLOR EVOKED BY A SINGLE WAVELENGTH OF LIGHT IN THE VISIBLE SPECTRUM
Spectral colour; Spectral colors; Monochrome radiation; Spectral locus; Spectral Locus; Non-spectral color; Extra-spectral color
![when all colors of light are mixed together, they produce white]].](https://commons.wikimedia.org/wiki/Special:FilePath/CIE1931xy blank.svg?width=200 "when all colors of light are mixed together, they produce white]].")
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Spectral color
A spectral color is a color that is evoked in a typical human by a single wavelength of light in the visible spectrum, or by a relatively narrow band of wavelengths, also known as monochromatic light. Every wavelength of visible light is perceived as a spectral color, in a continuous spectrum; the colors of sufficiently close wavelengths are indistinguishable for the human eye.
Serre spectral sequence
SPECTRAL SEQUENCE RELATING THE SINGULAR COHOMOLOGY OF THE TOTAL SPACE OF A SERRE FIBRATION IN TERMS OF THE COHOMOLOGIES OF THE BASE SPACE AND THE FIBER
Leray-Serre spectral sequence; Leray–Serre spectral sequence; Spectral sequence for the covering
In mathematics, the Serre spectral sequence (sometimes Leray–Serre spectral sequence to acknowledge earlier work of Jean Leray in the Leray spectral sequence) is an important tool in algebraic topology. It expresses, in the language of homological algebra, the singular (co)homology of the total space X of a (Serre) fibration in terms of the (co)homology of the base space B and the fiber F.
Spectral edge frequency
![The spectral density of a [[fluorescent light]] as a function of optical wavelength shows peaks at atomic transitions, indicated by the numbered arrows.](https://commons.wikimedia.org/wiki/Special:FilePath/Fluorescent lighting spectrum peaks labelled.svg?width=200 "The spectral density of a [[fluorescent light]] as a function of optical wavelength shows peaks at atomic transitions, indicated by the numbered arrows.")
![The power spectrum of the measured [[cosmic microwave background radiation]] temperature anisotropy in terms of the angular scale. The solid line is a theoretical model, for comparison.](https://commons.wikimedia.org/wiki/Special:FilePath/PowerSpectrumExt.svg?width=200 "The power spectrum of the measured [[cosmic microwave background radiation]] temperature anisotropy in terms of the angular scale. The solid line is a theoretical model, for comparison.")
![Spectrogram of an [[FM radio]] signal with frequency on the horizontal axis and time increasing upwards on the vertical axis.](https://commons.wikimedia.org/wiki/Special:FilePath/Spectrogram-fm-radio.png?width=200 "Spectrogram of an [[FM radio]] signal with frequency on the horizontal axis and time increasing upwards on the vertical axis.")
RELATIVE IMPORTANCE OF CERTAIN FREQUENCIES IN A COMPOSITE SIGNAL
Signal frequency spectrum; Power spectrum; Spectral envelope; Power spectral density; Power-spectral density function; Spectral power density; Signal spectrum; Spectral edge frequency; Acceleration spectral density; W/Hz; DBm/Hz; Energy spectral density; Spectral density function; Spectral phase; Phase spectrum; Spectral distribution function; Spectral function; Cross-spectral density; Frequency spectrum; Spectral density (signal processing); Spectral energy density; Fluctuation spectrum; Fluctuation spectra; Amplitude spectral density; Amplitude spectrum; Cross power spectral density; Power spectra; Phase spectral density; Cross-power spectrum
The spectral edge frequency or SEF is a measure used in signal processing. It is usually expressed as "SEF x", which stands for the frequency below which x percent of the total power of a given signal are located.
Spectral density
RELATIVE IMPORTANCE OF CERTAIN FREQUENCIES IN A COMPOSITE SIGNAL
Signal frequency spectrum; Power spectrum; Spectral envelope; Power spectral density; Power-spectral density function; Spectral power density; Signal spectrum; Spectral edge frequency; Acceleration spectral density; W/Hz; DBm/Hz; Energy spectral density; Spectral density function; Spectral phase; Phase spectrum; Spectral distribution function; Spectral function; Cross-spectral density; Frequency spectrum; Spectral density (signal processing); Spectral energy density; Fluctuation spectrum; Fluctuation spectra; Amplitude spectral density; Amplitude spectrum; Cross power spectral density; Power spectra; Phase spectral density; Cross-power spectrum
The power spectrum S_{xx}(f) of a time series x(t) describes the distribution of power into frequency components composing that signal. According to Fourier analysis, any physical signal can be decomposed into a number of discrete frequencies, or a spectrum of frequencies over a continuous range.
Spectral envelope
RELATIVE IMPORTANCE OF CERTAIN FREQUENCIES IN A COMPOSITE SIGNAL
Signal frequency spectrum; Power spectrum; Spectral envelope; Power spectral density; Power-spectral density function; Spectral power density; Signal spectrum; Spectral edge frequency; Acceleration spectral density; W/Hz; DBm/Hz; Energy spectral density; Spectral density function; Spectral phase; Phase spectrum; Spectral distribution function; Spectral function; Cross-spectral density; Frequency spectrum; Spectral density (signal processing); Spectral energy density; Fluctuation spectrum; Fluctuation spectra; Amplitude spectral density; Amplitude spectrum; Cross power spectral density; Power spectra; Phase spectral density; Cross-power spectrum
A spectral envelope is the envelope curve of the amplitude spectrum. It describes one point in time (one window, to be precise).
Spectral efficiency
INFORMATION RATE THAT CAN BE TRANSMITTED OVER A GIVEN BANDWIDTH
Spectrum efficiency; System spectrum efficiency; System spectral efficiency; Link spectral efficiency; Bandwidth efficiency; BandWidth efficiency; Area spectral efficiency; Spectral efficiency comparison table; Bit/s/Hz; Bits/s/Hz; (bit/s)/Hz; (bit/s)/Hertz; Modulation efficiency; Channel spectral efficiency
Spectral efficiency, spectrum efficiency or bandwidth efficiency refers to the information rate that can be transmitted over a given bandwidth in a specific communication system. It is a measure of how efficiently a limited frequency spectrum is utilized by the physical layer protocol, and sometimes by the medium access control (the channel access protocol).
Spectral line shape
![vibronic progression]]](https://commons.wikimedia.org/wiki/Special:FilePath/Permanganate spectrum.png?width=200 "vibronic progression]]")
IN SPECTROSCOPY, THE FORM OF A FEATURE CORRESPONDING TO AN ENERGY CHANGE IN AN ATOM, MOLECULE, OR ION
Spectroscopic line shape; Line profile; Spectral line profile
Spectral line shape describes the form of a feature, observed in spectroscopy, corresponding to an energy change in an atom, molecule or ion. This shape is also referred to as the spectral line profile.
Spectral method
CLASS OF METHODS USED IN NUMERICAL ANALYSIS, SCIENTIFIC COMPUTING TO SOLVE ODE/PDE
Spectral methods; Chebyshev spectral method
Spectral methods are a class of techniques used in applied mathematics and scientific computing to numerically solve certain differential equations. The idea is to write the solution of the differential equation as a sum of certain "basis functions" (for example, as a Fourier series which is a sum of sinusoids) and then to choose the coefficients in the sum in order to satisfy the differential equation as well as possible.
Asteroid spectral types
CLASSIFICATION TYPE OF A CLASS OF OBJECTS
List of asteroid types; Asteroid classification; Tholen spectral classification; Tholen classification; SMASS classification; Asteroid taxonomy; SMASS; Small Main-Belt Asteroid Spectroscopic Survey; Asteroid color indices; Asteroid spectral type; Eight-Color Asteroid Survey; Minor planet color indices; Small Solar System Objects Spectroscopic Survey; S3OS2; Bus–DeMeo taxonomy; Bus-DeMeo taxonomy; Lazzaro classification; Bus–DeMeo classification; Bus-DeMeo classification
An asteroid spectral type is assigned to asteroids based on their emission spectrum, color, and sometimes albedo. These types are thought to correspond to an asteroid's surface composition.
Frölicher spectral sequence
Frohlicher spectral sequence; Froehlicher spectral sequence; Fröhlicher spectral sequence; Frolicher spectral sequence; Froelicher spectral sequence
In mathematics, the Frölicher spectral sequence (often misspelled as Fröhlicher) is a tool in the theory of complex manifolds, for expressing the potential failure of the results of cohomology theory that are valid in general only for Kähler manifolds. It was introduced by .
Википедия
Spectral color
A spectral color is a color that is evoked by monochromatic light, i.e. either a single wavelength of light in the visible spectrum, or a relatively narrow band of wavelengths (e.g. lasers). Every wavelength of visible light is perceived as a spectral color; when viewed as a continuous spectrum, these colors are seen as the familiar rainbow.
All colors that do not qualify as a spectral color are called non-spectral colors or extra-spectral colors. Extra-spectral colors cannot be evoked with a single wavelength of light, but rather by a combination of wavelengths. Likewise, light comprising several wavelengths cannot evoke a spectral color.
