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

完成半带滤波器的信号产生，和滤波器系数输出。输出信号时域谱和频谱。-The completion of half-band filter the signal generator, and filter coefficient of the output. Time-domain output signal spectrum and spectrum.