Article,

Correlations, contrasts, and components: Fourier analysis in a more familiar terminology.

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Behavior Research Methods & Instrumentation, 15 (2): 228-241 (1983)

Abstract

The Fourier transform partitions the energy in a waveform into the sum of the energies of simpler components. This process is the same as the partitioning of variance into linear contrasts and is a way of measuring the correlation between the waveform and each member of a family of prototype model waveforms. Such a partitioning will often, but not always, result in a meaningful decomposition of the original waveform.

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