Freeware Listing: Fourier Transform

This program is open source code of fast Fourier transform in matlab. Where y is the input argument and p is the normalized size of the input. Let y = [1 2 3 4 ]; x= length(y); m= log2(x); p= ceil(m); To call the function use ft2(y,p);.

  • Platform: Matlab, Scripts

The Fourier Transform is a powerful tool allowing us to move back and forth between the spatial and frequency domains. Many of our explanations of key aspects of signal processing rely on an understanding of how and why a certain operation is performed in one domain or another. This applet helps students feel comfortable with these explanations, helping to build a strong intuitive grasp of how signals in one domain correspond to signals in the other.

Students can load scanlines from common image patterns and see that scanline's Fourier Transform in real-time. For example, they can load the scanline of a standard test image to note how most of the energy is concentrated at low frequencies -- a key to why low-pass filtering doesn't render an image unintelligible.

  • Platform: Win2000, Windows 7, WinOther

User-friendly 2D FFT/iFFT (Fast Fourier Transform) plug-in for Adobe PhotoShop compatible plug-in hosts. It uses one of the fastest implementations of the Discrete Fourier Transform and has many applications including periodic noise removal and pattern detection. This can be very useful in analyzing fingerprints, paper sieve patterns etc..

  • Publisher: KamLex
  • Date: 23-07-2012
  • Size: 390 KB
  • Platform: WinOther

A Fast Fourier Transform (FFT) method for frequency sparse functions. Recovers the k most energetic frequencies hidden in a bandwidth-N function in k*polylog(N) time..

  • Platform: WinOther

Description and detailed explanation on Fourier Transform, some FFT, LPC etc. Runable project demonstrates DCT transform on continuous audio, show and edit audio source with different zooming and view..

  • Platform: WinOther

This program calculates the non-destructive zoom Fast Fourier transform of a time history. The input file must be time(sec) and amplitude(units) Reference: Randall, Frequency Analysis, Bruel & Kjaer, page 170..

  • Publisher: Tom Irvine
  • Date: 26-04-2013
  • Size: 10 KB
  • Platform: Matlab, Scripts

function [g] = FFTPF1D (X,binsize, f, P) Discrete Fourier Transform Low/High Pass Filter. % This is a simply implement of such a filter for a given 1-D data. X: the array of you data, each data point is a bin of signal binsize: the bin size in your data data f: the cutoff of wave length, P: 1, or 0, true or false : true, low pass, which eliminating higher than f frequence signals, false, high pass, which eliminating lower than f frequence signals. It could be easily modified into 2-D version, or translated into R/S-language. Example: a=1:2:1000; b=sin(a) + sin(2.*a) + sin(0.1 .* a) + .

  • Platform: Matlab, Scripts

This function returns N point DFT samples of 2dw band of Fourier transform of a sequence. Typically, fft() returns N samples of Fourier transform ranging from 0 to 2pi. This function takes the N-point DFT samples and returns N-point samples corresponding to frequency band wc-dw to wc+dw..

  • Platform: Matlab, Scripts

Voxengo SPAN Plus is a handy and reliable VTS plugin designed to analyze audio spectrums in real time via the Fast Fourier Transform (FFT method).

Voxengo SPAN Plus is an extended version of Voxengo Span, with enhancements in spectrum display and import / export operations.


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  • Platform: Win7 x64, Windows 7, WinOther, WinVista, WinVista x64

DSP Test is a handy application designed to help you understand the Discrete Fourier Transform concept.

The program can calculate and plot the DFT of a random time domain signal, which is drawn by the user. Based on the cutoff frequency, DSP Test automatically generates the reconstructed signal.


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  • Platform: Windows 7, Windows 8, WinOther, WinVista

Finding the Fourier transform of a rectangular pulse.. filtering the spectrum and regenerating the signal using the filtered spectrum is done... at the end Rayleigh theorem is proved by showing that the energy content of both time domain and frequency domain signals are equal.. your comments are required......

  • Platform: Matlab, Scripts

Fourier Transform Lab Student Edition is an advanced application designed for performing Fourier transformations, which can be useful in teaching Crystallography, since they are related to Optical Transforms (e.g. laser diffraction patterns). Furthermore one may get a quick hands-on experience with the usefulness of processing images in the frequency domain for certain band filters etc. FEATURES: · Forward & Inverse Fourier Transform · Low-Pass Filter · High-Pass Filter · Custom-Mask Filter (for removing Fourier peaks) · Image Histograms, Images may be dragged · Swap Phase Sets · Randomize / Discard FT Phases · Randomize / Discard FT Magnitudes · Easy Image Import (Load, Paste, Drag-Drop) · Basic Image Drawing Function (Freehand & Lattice) · Basic Scripting Functions · Extensive HTML Tutorial (Aubert,...

  • Platform: WinOther

This is a program that splits sound taken from the microphone into its basic frequencies and displays them real-time in a window. You can whistle to the microphone and see the plot going up and down with the change of pitch. The program uses the Fast Fourier Transform (FFT) algorithm..

  • Platform: WinOther

NIST benchmark for librandomtest.so checking. Includes source and object code. Eclipse and gcc parameters included. Implemets the following tests: Approximate Entropy, Block Frequency, Cumulative Sums, Discrete Fourier Transform, Linear Complexity, Longest Run Of Ones, Rank, Overlapping Template Matchings, Runs, Serial, Universal..

  • Platform: Linux, Linux Console, Linux GPL, Unix

NIST benchmark for random stream checking. Includes source and object code. Visual C++ 2008 project paramaters included. Implemets the following tests: Approximate Entropy, Block Frequency, Cumulative Sums, Discrete Fourier Transform, Linear Complexity, Longest Run Of Ones, Rank, Overlapping Template Matchings, Runs, Serial, Universal..

  • Platform: Win2000, Windows Server, Windows Vista, WinOther

FREE DiceLock Security DiceCheck GUI and DLL Library. If in your process or software applications you have need for random number streams and you want to check that the input or output random stream is really at random, you can incorporate DiceChecker library in your applications to be sure that the random streams are at random. Incorporate random number tests in your applications. The C++ library contains classes implementing Frequency Test, Block Frequency Test, Cumulative Sum Forward Test, Cumulative Sum Reverse Test, Runs Test, Longest Run Of Ones Test, Overlapping Template Matching Test, Rank Test, Universal Test, Approximate Entropy Test, Serial Test, Discrete Fourier Transform Test, Linear Complexity Test.

  • Platform: Windows Server, Windows Vista, WinOther

FREE DiceLock Security JDiceCheck Windows GUI and extension .jar library. If in your process or software applications you have need for random number streams and you want to check that the input or output random stream is really at random, you can incorporate JDiceChecker library in your applications to be sure that the random streams are at random. Incorporate random number tests in your applications. The Java library contains classes implementing Frequency Test, Block Frequency Test, Cumulative Sum Forward Test, Cumulative Sum Reverse Test, Runs Test, Longest Run Of Ones Test, Overlapping Template Matching Test, Rank Test, Universal Test, Approximate Entropy Test, Serial Test and Discrete Fourier Transform Test.

  • Platform: Java, Win2000, Windows Server, Windows Vista, WinOther

FREE DiceLock Security JDiceCheck Linux GUI and extension .jar library. If in your process or software applications you have need for random number streams and you want to check that the input or output random stream is really at random, you can incorporate JDiceChecker library in your applications to be sure that the random streams are at random. Incorporate random number tests in your applications. The Java library contains classes implementing Frequency Test, Block Frequency Test, Cumulative Sum Forward Test, Cumulative Sum Reverse Test, Runs Test, Longest Run Of Ones Test, Rank Test, Universal Test, Approximate Entropy Test, Serial Test and Discrete Fourier Transform Test.

  • Platform: Java, Linux, Linux Console, Linux Gnome, Linux GPL, Linux Open Source

FREE DiceLock Security JDiceCheck Mac OS X 10.6 GUI and extension .jar library. If in your process or software applications you have need for random number streams and you want to check that the input or output random stream is really at random, you can incorporate JDiceChecker library in your applications to be sure that the random streams are at random. Incorporate random number tests in your applications. The Java library contains classes implementing Frequency Test, Block Frequency Test, Cumulative Sum Forward Test, Cumulative Sum Reverse Test, Runs Test, Longest Run Of Ones Test, Rank Test, Universal Test, Approximate Entropy Test, Serial Test and Discrete Fourier Transform Test.

  • Platform: Java, Mac OS X, Mac OS X 10.4, Mac OS X 10.5

FREE DiceLock Security JDiceChecker Java .jar library. Mac OS X 10.6 .pkg package installer program. If in your process or software applications you have need for random number streams and you want to check that the input or output random stream is really at random, you can incorporate JDiceChecker library in your Java applications to be sure that the random streams are at random. Incorporate random number tests in your applications. The Java .jar library contains classes implementing Frequency Test, Block Frequency Test, Cumulative Sum Forward Test, Cumulative Sum Reverse Test, Runs Test, Longest Run Of Ones Test, Rank Test, Universal Test, Approximate Entropy Test, Serial Test, Discrete Fourier Transform Test.

  • Platform: Java, Mac OS X, Mac OS X 10.5

Fourier Transform: Freeware | All

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