2007年全国电子设计，音频分析仪，基于正点原子mini开发板。用的STM32自带AD，定时器精确控制采样率，通过FFT变换，实现频谱显示、功率显示、周期性判断等。-2007 National Electronic Design, audio analyzers, atomic mini development board based on punctuality. The STM32 comes with AD, precise control of the sample rate timer