fft算法的实现，对刚接触dsp开发的朋友有很大的帮助-fft

fft信号发生，产生连续的余弦信号，分别用C语言编写-fft signal, resulting in continuous cosine signals, respectively, with C language

基于C语言的任意n点FFT算法实现。可自动实现16位以内的位倒序。输入实数数列，输出复数数列。-The realization of arbitrary point n C language based on FFT algorithm. Bit reverse more than 16 can automatically realize. In real sequence, the output of complex numbers.