The representation of a PERIODIC sound or WAVEFORM as a sum of Fourier components ... vol. 22, no. 2, p. 26, used by permission of the authors and the American Institute of Physics). Three-dimensional ...

While the Fourier ... transform by -i sgn(ω), but that isn’t really going to help you much in a practical sense. If you don’t want to bog down in the math, skip immediately to section two ...