应用傅里叶变换DFT，分析各种离散信号x(k)的频谱。 1.1离散周期信号 -Application of Fourier Transform DFT, analysis of discrete signal x (k) spectrum. 1.1 discrete periodic signal

Blackman窗分析频谱，周期信号的截断，不同采样方式周期信号的频谱，信号序列的过零点查找与二次采样-Blackman window analysis of the spectrum, periodic signal truncation, different sampling methods periodic signal spectrum, the signal sequence of zero-crossing point search and the second sampling

stm32:定时器中断,10Khz的计数频率，计数500ms stm32时延任务；创建一个周期任务用于每200毫秒往队列中发送五个数值，发送完成产生一个软件中断。-stm32: timer interrupt, 10Khz frequency counting, counting 500ms stm32 delay task create a periodic task for every 200 milliseconds to send five values ​ ​