Editing Spectral analysis

'''Spectral analysis''' or '''spectrum analysis''' is [[analysis]] in terms of a [[spectrum]] of [[frequencies]] or related quantities such as [[energies]], [[eigenvalues]], etc.  In specific areas it may refer to: 

* [[Spectroscopy]] in chemistry and physics, a method of analyzing the properties of matter from their electromagnetic interactions
* [[Spectral estimation]], in statistics and signal processing, an algorithm that estimates the strength of different frequency components (the power spectrum) of a time-domain signal.  This may also be called [[frequency domain]] analysis
* [[Spectrum analyzer]], a hardware device that measures the magnitude of an input signal versus frequency within the full frequency range of the instrument
* [[Spectral theory]], in mathematics, a theory that extends eigenvalues and eigenvectors to linear operators on Hilbert space, and more generally to the elements of a [[Banach algebra]]
* In nuclear and particle physics, gamma spectroscopy, and high-energy astronomy, the analysis of the output of a [[pulse height analyzer]] for characteristic features such as [[spectral line]], edges, and various physical processes producing continuum shapes

==See also==
*[[Multispectral analysis]]
*[[Harmonic analysis]]

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