直流信号与能量信号卷积的本质思考
2016-01-18任蕾
任蕾
摘要:卷积是信号与系统课程中的一个重要知识点,是沟通系统时域分析与变换域分析方法的桥梁。直流信号作为一类特殊信号,与能量信号进行卷积运算时,一般可结合卷积定义或卷积的各类性质实现。这一类卷积计算的本质可理解为直流激励通过线性时不变系统,或者信号通过全积分系统,其卷积结果为系统的零状态响应。通过几个例子介绍了该类卷积计算的本质和计算过程中需注意的问题。
关键词:卷积;信号与系统;直流激励;能量信号
中图分类号:TN911 文献标识码:A 文章编号:1009-3044(2015)33-0152-02
The Nature of Convolution Between Direct Current Signal and Energy Signals
REN Lei
(College of Information Engineering, Shanghai Maritime University, Shanghai 201306, China)
Abstract: Convolution is one important knowledge point of signal and system, which is the bridge between time-domain analysis method and transform-domain analysis method for system. Generally, convolution of direct current signal and other signals can be conducted using the definition and properties of convolution. The nature of such convolution is considered as the process that direct current signal as excitation signal through a linear time-invariant system or through all integration system. The result of convolution is the zero-state response of system. Several examples are provided to show the nature of convolution and the notes about it are also pointed out.
Key words: convolution; signal and system; direct current excitation of system; energy signal
3 结束语
卷积不仅是一种积分运算,在线性时不变系统分析中,卷积运算有重要作用。系统的零状态响应可由激励信号与系统冲激响应卷积求得,因此,深刻理解其含义和本质有助于本知识点的学习。本文着重讨论了直流信号与能量信号卷积的本质和计算,通过例题说明了其卷积计算的过程和本质。
参考文献:
[1] 奥本海姆.信号与系统[M]. 刘树棠,译.2版.西安:西安交通大学出版社,1998.
[2] Simon Haykin.信号与系统 [M]. 秩盛,译. 2版.北京:电子工业出版社,2006.
[3] 郑君里,应启珩,杨为理.信号与系统[M].北京:高等教育出版社,2000.
[4] 管致中,夏恭恪,孟桥.信号与线性系统[M]. 4版.北京:高等教育出版社,2004.
[5] 吴大正.信号与线性系统分析 [M]. 4版.北京:高等教育出版社,2006.
[6] 杨忠根. 信号与系统[M].北京:电子工业出版社,2012.
[7] 李华图. 关于卷积及其存在性的探讨[J]. 重庆:重庆邮电大学学报,1999,11(1):69-72.
[8] 王晓翔,黄静,梁忞飞. 关于卷积的运算规则及存在性[J].电气电子教学学报,2012,34(2):39-42.
[9] 周井泉. 卷积结合律成立的条件[J].电气电子教学学报,2004,26(2):43-45.