Fourier analysis may be generally described
as the representation of a sound's frequency components as a sum of pure
sinusoidal waves (Truax,
Handbook for Acoustic Ecology: 51). An analysis of
a sound's frequency components is taken at a steady state to give an approximation
of that sounds spectrum. As most natural sounds are spectrally dynamic,
one single Fourier analysis could not possibly represent a sound in sine
waves. By 'windowing', a Fast Fourier Transform takes several of these
approximations and strings them together to better predict a sound's spectrum
over time. |