建立信号的频谱概念 理解信号通过线性系统的基本分析方法及其物理意义 掌握系统的时域分析和频域分析的对应关系 培养学生分析、对比、归纳、总结的能力 -Signal spectrum to establish the concept of understanding the signal through the linear system analysis methods and their basic physical meaning master system time-domain analy

频域采样重建序列和原序列的时域波形，原始频谱与补零频谱的比较等-Frequency-domain sample sequence and the reconstruction of the original sequence of time-domain waveform, the original spectrum with zero spectrum comparison