Spectral analysis

Spectral analysis or Spectrum analysis may refer to:

• Spectrum analysis in chemistry and physics, a method of analyzing the chemical properties of matter from bands in their visible spectrum
• Spectrum analyzer in signal processing, a device or algorithm that identifies a frequency domain representation of a time domain signal, typically by means of Fourier transform
• 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
• Spectral analysis in statistics, a procedure that decomposes a time series into a spectrum of cycles of different lengths. Spectral analysis is also known as frequency domain analysis
• 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