twiddle factor - a part of cooley-tukey algorithm

FFT控制器需要的旋转因子数据，可以直接使用-FFT twiddle factor data controller is required，Can be used directly

An Elementary Introduction to the Discrete Fourier Transform 1.1 ComplexNumbers 1.3 Analyzing the Series 1.5 Filtering a Signal 1.6 How Often Does One Sample? 1.7 Notes and References 1.2 Trigonometric Interpolation 1.4 Fourier Frequenc