可以实现FFT的变换域的实现，通过点数的确认，可以实现fft变换 -FFT can achieve the realization of the transform domain, through the confirmation point can be achieved fft transform

IP核！！高速傅立叶变换的VHDL源代码 可以综合-IP core! ! High-speed Fourier transform of the VHDL source code can be integrated!!