说明：  综合运用信号与系统、数字信号处理的理论知识进行频谱分析和滤波器设计，通过理论推导得出相应结论，再利用MATLAB作为编程工具进行计算机实现从而加深对所学知识的理解，建立概念。
(The integrated use of signals and systems, digital signal processing theory of knowledge spectrum analysis and filter design, the corresponding results obtained through theoretical derivation, then the use of MATLAB as a programming tool for the computer to achieve and enhance their understanding of what they have learned to establish the concept.)