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