musicdsp source code archive-Analysis Beat Detector Class Coefficients for Daubechies wavelets 1-38 DFT Envelope detector Envelope Detector class (C++) Envelope follower with different attack and release Fast in-place Walsh-Hadamard Tra

fft的快速实现，核心部分无任何耗时的sin,cos运算，所需要的数据初始化时全部已经计算好了。并且提供了fft的定点代码（这是很多fft不具有的），可以方便地移植到嵌入式和DSP环境-fft of rapid implementation, the core portion without any time-consuming sin cos operation, the initialization of the data needed all been calculated. And pr