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Article 10 Category. Digital signal processing (DSP) software development. Abstract.

Fast Fourier transform — FFT — Librow — Software development

http://www.librow.com/articles/article-10
http://en.wikipedia.org/wiki/Discrete_Fourier_transform

Discrete Fourier transform

Relationship between the (continuous) Fourier transform and the discrete Fourier transform. Left column: A continuous function (top) and its Fourier transform (bottom). Center-left column: Periodic summation of the original function (top). Fourier transform (bottom) is zero except at discrete points.
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Discrete Fourier Transform Tutorial

The DFT “à Pied”: Mastering The Fourier Transform in One Day : The DSP Dimension

http://www.dspdimension.com/admin/dft-a-pied/ Posted by Bernsee on September 21, 1999 · 65 Comments If you’re into signal processing, you will no doubt say that the headline is a very tall claim. I would second this.