[英语学习]Chapter1 Signals and Systems.pptVIP

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[英语学习]Chapter1 Signals and Systems.ppt

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[英语学习]Chapter1 Signals and Systems

Signals Systems 主讲老师：刘馨琼联系方式：xq_helen@ 教材：Alan V.Oppenheim 《Signals and Systems》电子工业出版社刘海棠译《信号与系统》西安交通大学出版社参考教材：郑君里等《信号与系统》高等教育出版社 Chapter 1 SignalsSystems 1.0 introduction 1 The concept of Signal The signals, which are functions of one or more independent variables, contain information about the behavior or nature of some phenomenon. 2 The definition and description of Signal 1.1 Continuous-time and Discrete-time Signals 1. Continuous time signals:Variable is continuous, and thus the signals are defined for a continuum of values of the independent variable. We denote it as x(t). Example of Continuous-time Signals [fig1] 2.Discrete time signals: Variables are defined only at discrete times, the independent variable takes on only a discrete set of values. We denote it as x[n]. Example of Discrete-time Signals [fig2] 1.1 Continuous-time and Discrete-time Signals 1.1 Continuous-time and Discrete-time Signals 1.1 Continuous-time and Discrete-time Signals The total energy over an infinite time interval in continuous-time is defined as: The total energy over an infinite time interval in discrete-time is defined as: 1.1 Continuous-time and Discrete-time Signals The time-averaged power over an infinite time interval in continuous-time is defined as: The time-averaged power over an infinite time interval in discrete-time is defined as: 1.1 Continuous-time and Discrete-time Signals Infinite-energy Signals: Infinite time-averaged power Signals: 1.2 Transformations of The independent Variable 1.2 Transformations of The independent Variable 1.2 Transformations of The independent Variable 1.2 Transformations of The independent Variable 1.2 Transformations of The independent Variable FIG 2 Fig 3 1.3 Exponential And Sinusoidal Signals The continuous-time Complex exponential