信号与系统奥本海姆原_版第一章.pptVIP

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信号与系统奥本海姆原_版第一章

* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * 1 Signal and System Periodicity Properties * 1 Signal and System 1.4 The Unit Impulse and Unit Step Functions 1.4.1 The Discrete-time Unit Impulse and Unit Step Sequences (1) Unit Sample(Impulse): * 1 Signal and System Unit Step Function: (2) Relation Between Unit Sample and Unit Step or * 1 Signal and System (3) Sampling Property of Unit Sample * 1 Signal and System Illustration of Sampling * 1 Signal and System 1.4.2 The Continuous-time Unit Step and Unit Impulse Functions (1) Unit Step Function: * 1 Signal and System Unit Impulse Function: * 1 Signal and System (2) Relation Between Unit Impulse and Unit Step * 1 Signal and System (3) Sampling Property of ?(t) Example 1.7 * 1 Signal and System 1.5 Continuous-time and Discrete-time System Definition: (1) Interconnection of Component,device, subsystem…. (Broadest sense) (2) A process in which signals can be transformed. (Narrow sense) Representation of System: (1) Relation by the notation * 1 Signal and System (2) Pictorial Representation Continuous-time system x(t) y(t) Discrete-time system x[n] y[n] * 1 Signal and System 1.5.1 Simple Example of systems Example 1.8: RC Circuit in Figure 1.1 : Vc(t) ? Vs(t) RC Circuit (system) vs(t) vc(t) * 1 Signal and System Example 1.10: Balance in a bank account from month to month: balance y[n] net deposit x[n] interest 1% so y[n]=y[n-1]+1%?y[n-1]+x[n] or y[n]-1.01y[n-1]=x[n] Balance in bank (system) x[n] y[n] * 1 Signal and System 1.5.2 Interconnections of System (1) Series(cascade) interconnection * 1 Signal and System (2) Parallel interconnection Series-Parallel interconnection * 1 Signal and System (3) Feed-back interconnection * 1 Signal and System Example of Feed-back inte

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