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1、Chapter 2 Discrete-Time Signals andSystems in the Time-DomainLecture 3Key PointsDiscrete-Time SystemsWhat is the impluse response of an LTI-system how to obtain it based on its definition?2LTIDiscrete-Time SystemsInput-Output relationship3LTIyn = xn hn*hnCalculate the convolution sum in time-domainA

2、nalytical method (not recommended)& Graphical method (strongly recommended) Example xn=-2,0,1,-1,3,n=0,1,2,3,4 hn=1 ,2, 0, -1,n=0,1,2,3, solve yn,n=0,1,.7Determine the range for ynCalculate the convolution sum 40+04+3Discrete-Time SystemsHow to determine whether a DT system is stable or not given hn

3、?A discrete-time LTI system is BIBO stable if and only if its impulse response sequence hn is absolutely summable, i.e.5SHow to determine the stability of a discrete-time system? Definition If , we have . Time-domain (使用前提:系統(tǒng)是LTI的) Z-domain S(pre-condition: The system must be LTI)Discrete-Time Syste

4、msHow to determine whether a DT system is causal or not given hn?A discrete-time LTI system is causal if and only if its impulse response hn is a causal sequence, i.e., hk=0, for k07How to determine the causality of a discrete-time system? Definition Time-domain If its impulse response hn is a causal sequence (

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