该开源库名为：Fast Forier Transform in the West, FFTW；是MIT的一个名为Matteo Frigo 的人编写的，目前该库经过SSE,SSE2，AVX等X86上汇编指令的优化；同时，最新版将支持ARM
Neon指令集；而且，它是一个纯C的库，在任何操作系统中，都可以用C编译器来编译运行； 以下是FFTW的官方介绍：FFTW is a free collection of fast C routines for computing the Discrete Fourier Transform in one or more dimensions. It includes complex, real,
symmetric, and parallel transforms, and can handle arbitrary array sizes efficiently. FFTW is typically faster than other publically-available FFT implementations, and is even competitive with vendor-tuned libraries. (See our web page for extensive benchmarks.)
To achieve this performance, FFTW uses novel code-generation and runtime self-optimization techniques (along with many other tricks). 需要的朋友请到这里：http://www.fftw.org/index.html
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