1280点fft变换，改变传统的需2046点FFT的情况。-1280 point FFT，radix 4 and radix 5

傅里叶级数变化，进行信号的分析预处理，同时完成基本的傅里叶变化，对信号处理有很多作用-Fourier series change, the analysis of the signal preprocessing, while completing the basic Fourier transform, there are many effects on signal processing