Fourier Transform Pairs
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For every time domain waveform there is a corresponding frequency domain waveform, and vice versa. For example, a rectangular pulse in the time domain coincides with a sinc function in the frequency domain. Duality provides that the reverse is also true; a rectangular pulse in the frequency domain matches a sinc function in the time domain. Waveforms that correspond to each other in this manner are called Fourier transform pairs. Several common pairs are presented in this chapter.
The Scientist and Engineer's Guide to Digital Signal Processing, ©1997-1998 by Steven W. Smith. For more information visit the book's website at: www.DSPguide.com