# Translations:Fourier transform - book/2/en

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Geophysicists follow the same convention that electrical engineers use with respect to the Fourier transform. This practice is wise because electrical engineers write most of the books on digital filtering. Specifically, electrical engineers choose to use (which has a negative sign) in their definition of the Fourier transform and not (which has a positive sign), as mathematicians usually do. The variable *f *represents cyclical frequency in units of hertz (i.e., cycles per second). The electrical engineering version of the *Fourier transform* (or *spectrum*) of a two-sided wavelet *b* is