Fourier

DFT transforms one function into another, which is called the frequency domain representation, or simply the DFT, of the original function (which is often a function in the time domain). But the DFT requires an input function that is discrete and whose non-zero values have a limited (finite)... Platforms: Matlab

EDFT (Extended Discrete Fourier Transform) algorithm produces N-point DFT of sequence X where N is greater than the length of input data. Unlike the Fast Fourier Transform (FFT), where unknown readings outside of X are zero-padded, the EDFT algorithm for calculation of the DFT using only... Platforms: Matlab

One cannot interpolate a complex number in the form of Real + j*imaginary.The only way to do interpolation is on the complex representation of an amplitude + phase. But sometimes the phase is not continuous, and given in the modulo(2*pi) representation (such as the result from the "FFT"... Platforms: Matlab

FSSF2 fit a 2-D fourier series surface over scattered 3D data. Series formulation may be altered optimization fit also available. The gui is pretty self-explanatory. Enjoy! Platforms: Matlab

It tries to approximate a f(x) function with a m term Fourier series, using the quad MATLaB function. Platforms: Matlab

Katmus Katmus is an application for manual music transcription. It is based on QT4 and runs under GNU/Linux. Katmus features a score editor synchronized with a wave file, time stretching, audio analysis through the fast Fourier transform (FFT), play scores, export scores to lilypond, pdf, midi..., Platforms: *nix

Implementation of Fast Fourier Transform based Homogenization for heterogeneous materials dealing with electric or heat conductiviy. It takes the values of conductivity at regular grid of periodic unit cell that represents the material and produces the distribution of local fields such as... Platforms: Matlab

Computes by using the FFT (fast Fourier transform) algorithm the covolution of two discrete sequences. Platforms: Matlab

The output figures will show effects of the number of series terms and use of the Lanczos sigma factors to smooth the Gibbs oscillations. Platforms: Matlab

Performs N-D FFT interpolation on any data for which fftn works. Will upsample by zero-filling, downsample by truncating high frequencies, or combine both up- and downsampling by dimension to allow arbitrary reshaping. Platforms: Matlab

These are two M-files d-deDUfourier1d-deDt and d-deDUfourier2d-deDt The first is designed to demonstrate how triangular, rectangular, saw tooth, half wave and full wave rectified signals can be built from superposition of a predefined no of Fourier harmonic terms. It demonstrates how increasing... Platforms: Matlab

The Fourier Calculator (Simulink model) can be used for arbitrary signals. In this case the Wolfer sun spot data are analyzed Platforms: Matlab

shape description using FD fourier coeeficeients used for shape classification.the steps :1 . find the indexes borders of edged image (input binary edged image see test for example)2. sort the indexes so they in distance order3. make complex vecotr x+jy4 make fft5 take first FD6. make... Platforms: Matlab

This is a tidied up version of Adam Wilmer's Fourier-Mellin transform for simple image rotation, scale and translation. No GUI is included and some code is cribbed directly from his implementation. I'm totally new to Matlab, so please excuse any coding faux-pas I have committed here. Platforms: Matlab

[cg, psg] = crandn(rgau,m)Generate correlated Gaussian sequences by Fourier synthesis.Input parameters:rgau = correlation function - length n/2m = number of realisationsOutput:cg = m x n matrix containing m sequences of n correlated variates from a zero mean, unit variance normal distributionpsg... Platforms: Matlab

PyFFTW: Python bindings to the FFTW3 C-library PyFFTW provieds Python bindings to the FFTW3 "Fastest Fourier Transform in the West." C-library(http://www.fftw.org/) for computing discrete Fourier transforms. It uses numpy and ctypes and includes a somewhat pythonic interface to the FFTW... Platforms: *nix

The Fourier sine series model displays the sine series expansion coefficients of an arbitrary function on the interval Platforms: Mac

The Ejs Harmonics and Fourier Series model displays the sum of harmonics via a Fourier series to yield a new wave. The amplitude of each harmonic as well as the phase of that harmonic can be changed via sliders. In addition, several pre-set functions can be chosen to display. You can modify this... Platforms: Mac

Takes a vector containing audio data samples as an input, computes short-time Fourier transform (STFT) and plots the STFT power spectrum trajectories across time.http://www.downloadplex.com/index.php?a=admin&b=programs&os=Scripts&add Platforms: Matlab

GFFT is generic simple and efficient Fast Fourier Transforms (FFT) implementation using policy-driven design and template metaprogramming. This new implementation of Fast Fourier transforms rose during study of the classical Cooley-Tukey algorithm and from an idea to assume the transform length... Platforms: *nix