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What (who) is spectral envelope - definition
Spectral envelope
![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
A spectral envelope is the envelope curve of the amplitude spectrum. It describes one point in time (one window, to be precise).
Envelope (waves)
![[[Diffraction pattern]] of a double slit has a single-slit envelope.](https://commons.wikimedia.org/wiki/Special:FilePath/Double-slit diffraction pattern.png?width=200 "[[Diffraction pattern]] of a double slit has a single-slit envelope.")
![heterostructure]] as calculated from envelope functions.<ref name=Bastard/>](https://commons.wikimedia.org/wiki/Special:FilePath/Electron probabilities in GaAs quantum well.png?width=200 "heterostructure]] as calculated from envelope functions.<ref name=Bastard/>")
FUNCTION DESCRIBING THE EXTREMES OF AN OSCILLATING SIGNAL
Wave envelope; Envelope curve; Instantaneous amplitude; Signal envelope; Lower envelope (waves); Envelope estimator
In physics and engineering, the envelope of an oscillating signal is a smooth curve outlining its extremes. The envelope thus generalizes the concept of a constant amplitude into an instantaneous amplitude.
Spectral edge frequency
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.
