"Any complex waveform is composed of discrete sine waves in harmonic series. Fourier analysis is one method of analysing a sound to provide such a series, and a power spectrum is the result of such an analysis where the energy ine ach of teh harmonic components is usually displayed graphically." 
- . Arthropod Bioacoustics: Neurobiology and Behaviour. Ithaca, New York: Comstock; 1989.
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