对AD采样来的数据信号进行快速傅里叶变换，并将FFT后的频谱图和波形通过液晶LCD显示出来，对信号分析处理有很大帮助！-Sampling of the AD to the data signals fast Fourier transform, and FFT frequency spectrum and waveform after the adoption of liquid crystal LCD display, the signal analysis and processing of