twiddle factor

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• Twiddle factor — A twiddle factor, in fast Fourier transform (FFT) algorithms, is any of the trigonometric constant coefficients that are multiplied by the data in the course of the algorithm. This term was apparently coined by Gentleman amp; Sande in 1966, and… …   Wikipedia

• Twiddle — To twiddle means to touch lightly or play with. In computing, it refers to: * Making small or insignificant changes to source code, often without much understanding * Bit twiddling , or bit manipulation, algorithmically manipulating bits * The… …   Wikipedia

• Prime-factor FFT algorithm — The Prime factor algorithm (PFA), also called the Good Thomas algorithm (1958/1963), is a fast Fourier transform (FFT) algorithm that re expresses the discrete Fourier transform (DFT) of a size N = N 1 N 2 as a two dimensional N 1 times; N 2 DFT …   Wikipedia

• Cooley–Tukey FFT algorithm — The Cooley–Tukey algorithm, named after J.W. Cooley and John Tukey, is the most common fast Fourier transform (FFT) algorithm. It re expresses the discrete Fourier transform (DFT) of an arbitrary composite size N = N1N2 in terms of smaller DFTs… …   Wikipedia

• Cooley-Tukey FFT algorithm — The Cooley Tukey algorithm, named after J.W. Cooley and John Tukey, is the most common fast Fourier transform (FFT) algorithm. It re expresses the discrete Fourier transform (DFT) of an arbitrary composite size N = N 1 N 2 in terms of smaller… …   Wikipedia

• Fast Fourier transform — A fast Fourier transform (FFT) is an efficient algorithm to compute the discrete Fourier transform (DFT) and its inverse. There are many distinct FFT algorithms involving a wide range of mathematics, from simple complex number arithmetic to group …   Wikipedia

• Split-radix FFT algorithm — The split radix FFT is a fast Fourier transform (FFT) algorithm for computing the discrete Fourier transform (DFT), and was first described in an obscure paper by R. Yavne (1968) and subsequently rediscovered simultaneously by various authors in… …   Wikipedia

• Butterfly diagram — used for finding the most likely sequence of hidden states.Most commonly, the term butterfly appears in the context of the Cooley Tukey FFT algorithm, which recursively breaks down a DFT of composite size n = r m into r smaller transforms of size …   Wikipedia

• Bruun's FFT algorithm — Bruun s algorithm is a fast Fourier transform (FFT) algorithm based on an unusual recursive polynomial factorization approach, proposed for powers of two by G. Bruun in 1978 and generalized to arbitrary even composite sizes by H. Murakami in 1996 …   Wikipedia

• List of numerical analysis topics — This is a list of numerical analysis topics, by Wikipedia page. Contents 1 General 2 Error 3 Elementary and special functions 4 Numerical linear algebra …   Wikipedia

• List of mathematics articles (T) — NOTOC T T duality T group T group (mathematics) T integration T norm T norm fuzzy logics T schema T square (fractal) T symmetry T table T theory T.C. Mits T1 space Table of bases Table of Clebsch Gordan coefficients Table of divisors Table of Lie …   Wikipedia