Fourier Techniques and Applications

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Fourier Techniques and Applications

Edited by Bishnu Pal. Edited by Alexander Kokorin. Edited by Theophanides Theophile. Edited by Kresimir Delac. Edited by Sergey Mikhailov. Edited by Sylvie Manguin.

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Edited by Felix Chan. The Fourier variants can also be generalized to Fourier transforms on arbitrary locally compact Abelian topological groups , which are studied in harmonic analysis ; there, the Fourier transform takes functions on a group to functions on the dual group.

This treatment also allows a general formulation of the convolution theorem , which relates Fourier transforms and convolutions. See also the Pontryagin duality for the generalized underpinnings of the Fourier transform. More specific, Fourier analysis can be done on cosets, [5] even discrete cosets. In signal processing terms, a function of time is a representation of a signal with perfect time resolution , but no frequency information, while the Fourier transform has perfect frequency resolution , but no time information.

As alternatives to the Fourier transform, in time—frequency analysis , one uses time—frequency transforms to represent signals in a form that has some time information and some frequency information — by the uncertainty principle , there is a trade-off between these. These can be generalizations of the Fourier transform, such as the short-time Fourier transform , the Gabor transform or fractional Fourier transform FRFT , or can use different functions to represent signals, as in wavelet transforms and chirplet transforms , with the wavelet analog of the continuous Fourier transform being the continuous wavelet transform.

A primitive form of harmonic series dates back to ancient Babylonian mathematics , where they were used to compute ephemerides tables of astronomical positions. The classical Greek concepts of deferent and epicycle in the Ptolemaic system of astronomy were related to Fourier series see Deferent and epicycle: Mathematical formalism. In modern times, variants of the discrete Fourier transform were used by Alexis Clairaut in to compute an orbit, [10] which has been described as the first formula for the DFT, [11] and in by Joseph Louis Lagrange , in computing the coefficients of a trigonometric series for a vibrating string.

Historians are divided as to how much to credit Lagrange and others for the development of Fourier theory: Daniel Bernoulli and Leonhard Euler had introduced trigonometric representations of functions, [11] and Lagrange had given the Fourier series solution to the wave equation, [11] so Fourier's contribution was mainly the bold claim that an arbitrary function could be represented by a Fourier series.

The subsequent development of the field is known as harmonic analysis , and is also an early instance of representation theory.

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In signal processing , the Fourier transform often takes a time series or a function of continuous time , and maps it into a frequency spectrum. That is, it takes a function from the time domain into the frequency domain; it is a decomposition of a function into sinusoids of different frequencies; in the case of a Fourier series or discrete Fourier transform , the sinusoids are harmonics of the fundamental frequency of the function being analyzed. When the function f is a function of time and represents a physical signal , the transform has a standard interpretation as the frequency spectrum of the signal.

Fourier transforms are not limited to functions of time, and temporal frequencies. They can equally be applied to analyze spatial frequencies, and indeed for nearly any function domain. This justifies their use in such diverse branches as image processing , heat conduction , and automatic control. From Wikipedia, the free encyclopedia.

Fourier transforms Continuous Fourier transform Fourier series Discrete-time Fourier transform Discrete Fourier transform Discrete Fourier transform over a ring Fourier analysis Related transforms Branch of mathematics regarding periodic and continuous signals.

1. Introduction

Main article: Fourier transform. Main article: Fourier series. Main article: Discrete-time Fourier transform. Main article: Discrete Fourier transform. Further information: Time—frequency analysis. Random House. Criminalistics: An Introduction to Forensic Science. Theory and Application of Digital Signal Processing.

Fourier Methods in Signal Processing

Englewood Cliffs, NJ. Fourier Analysis on Coset Spaces. Rocky Mountain Journal of Mathematics.

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Fourier Series: Modeling Nature

Dover Publications. International Journal of Modern Physics E.

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