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代码说明：

  信号与系统是通信和电子信息类专业的核心基础课，其中的概念和分析方法广泛应用于通信、自动控制、信号与信息处理、电路与系统等领域。 (Signal and system is the communication and electronic information specialty core courses, one of the concepts and methods of analysis are widely used in communication, automatic control, signal and information processing, circuit and system etc..)