harmonic analysis(redirected from Fourier theory)
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harmonic analysis[här′man·ik ə′nal·ə·səs]
A study of functions by attempting to represent them as infinite series or integrals which involve functions from some particular well-understood family; it subsumes studying a function via its Fourier series.
Any method of identifying and evaluating the harmonics that make up a complex waveform of sound pressure, voltage, current, or some other varying quantity.