fft运算的类库。方便调用。是在linux下编译的。-fft library operations. Call convenience. In the compiler under linux.

fft运算的函数库。使用方便。linux下编译。-fft operations functions. Easy to use. Compiling under linux.

Special Requirements ?nx must be a power of 2. ?The index array must be set up by bitrev_index before the function DSP_bitrev_cplx is called. ?If nx ?4K, one can use the char (8-bit) data type for the "index" variable. This would requ

主要是fft和ifft算法的c实现.此算法是基2的DIT的FFT算法。-Fft and ifft algorithm using c. Algorithm radix-2 DIT FFT algorithm.