Anagram & Information om | Engelska ordet FFTS

Exempel på hur man kan använda FFTS i en mening

• Rader of MIT Lincoln Laboratory, is a fast Fourier transform (FFT) algorithm that computes the discrete Fourier transform (DFT) of prime sizes by re-expressing the DFT as a cyclic convolution (the other algorithm for FFTs of prime sizes, Bluestein's algorithm, also works by rewriting the DFT as a convolution).
• Nevertheless, Bruun's algorithm illustrates an alternative algorithmic framework that can express both itself and the Cooley–Tukey algorithm, and thus provides an interesting perspective on FFTs that permits mixtures of the two algorithms and other generalizations.
• FFTs became popular after James Cooley of IBM and John Tukey of Princeton published a paper in 1965 reinventing the algorithm and describing how to perform it conveniently on a computer.
• Once the transform has been broken up into subtransforms of sufficiently small sizes, FFTW uses hard-coded unrolled FFTs for these small sizes that were produced (at compile time, not at run time) by code generation; these routines use a variety of algorithms including Cooley–Tukey variants, Rader's algorithm, and prime-factor FFT algorithms.
• Mapped tasks include: filters, convolutional coders, interleavers, sorting, square root, CORDIC sin/cos/arcsin/arccos, matrix multiplication, pseudo random number generators, fast Fourier transforms (FFTs) of lengths 32–1024, a complete k=7 Viterbi decoder, a JPEG encoder, a complete fully compliant baseband processor for an IEEE 802.
• One large advantage of this specific method of parallelizing an mD DFT is that each of the 1D FFTs being performed in parallel on separate processors can then be performed in a concurrent fashion on Shared memory multithreaded SIMD processors.

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