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The Discrete Fourier Transform

Authored on: Mar 7, 2005 by Steven W. Smith

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Fourier analysis is a family of mathematical techniques, all based on decomposing signals into sinusoids. The discrete Fourier transform (DFT) is the family member used with digitized signals. This is the first of four chapters on the real DFT, a version of the discrete Fourier transform that uses real numbers to represent the input and output signals. In this chapter we look at the mathematics and algorithms of the Fourier decomposition, the heart of the DFT.

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

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