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project    

Exocortex.DSP - C# open source library for DSP
A C# open source library that provides fully featured (1) single and double precision complex number data types, (2) complex number math library, (3) 1D, 2D and 3D complex and real symmetric fast Fourier transforms, and (4) highly accurate statistical routines. The library is optimized for both speed and numerical accuracy. The reason that this library is called a 'Digital Signal Processing' library is because complex numbers, FFTs and...
preview: http://www.exocortex.org  

project    

FreqTweak
FreqTweak is a tool for FFT-based realtime audio spectral manipulation and display. It provides several algorithms for processing audio data in the frequency domain and a highly interactive GUI to manipulate the associated filters for each. It also provides high-resolution spectral displays in the form of scrolling-raster spectrograms and energy vs frequency plots displaying both pre- and post-processed spectra.
preview: http://freqtweak.sourceforge.net  

project    

KISS FFT
A Fast Fourier Transform based up on the principle, 'Keep It Simple, Stupid.' Kiss FFT is a very small, reasonably efficient, mixed radix FFT library that can use either fixed or floating point data types.
preview: http://sourceforge.net  

paper    

Parallel FFT Implementations on Fixed-Point DSP-Cores with Subword-Parallelism
Fast Fourier transform algorithms are vital in many digital signal-processing (DSP) applications. In here, both, radix-2 and radix-4 complex fast Fourier transform (FFT) implementations for fixed-point applications, using single instruction multiple data (SIMD) instructions and sub-word parallelism (SWP) is presented. It is shown that data management, and memory access are key to unleashing the arithmetic power of highly parallel digital...
preview: http://www.bittware.com   date: 1/1/2005

paper    

The Basics of NMR - Fourier Transforms
A detailed description of the Fourier transform ( FT ) has waited until now, when you have a better appreciation of why it is needed. A Fourier transform is an operation which converts functions from time to frequency domains. An inverse Fourier transform ( IFT ) converts from the frequency domain to the time domain.
preview: http://www.cis.rit.edu  

paper    

The Fast Fourier Transform Demystified
What is the Fourier Transform, anyway? And how does a nasty integral find its way into the electronics world? If you needed to know the relative strength of a signal in a certain frequency range, you could build a filter and measure the power that passes through. But what if you wanted to analyze more than one frequency band? Would you build hundreds of filters and hope that the components are accurate enough to get the signals you want?
preview: http://www.ghz.cc   date: 5/13/1996

comparison    

FFT Processor Chip Info Page
This page contains a comprehensive table listing key attributes of Fast Fourier Transform (FFT) chips such as speed, power, and word size. It also contains links to all sorts of FFT processors such as: special purpose chips, board-level products, soft/synthesizable processors, and programmable DSP chips.
preview: http://www-star.stanford.edu