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* For the 1st-order DT LTI system , is Or, In CT LTI system * The block diagram is If * In CT LTI system, if M=N * In general, So, * * Example 10.8.1, A DT LTI system function is Plot the direct, parallel, series form block diagram. * Solution: Direct form block diagram: * Parallel form block diagram * Series form block diagram * Problem: A DT-LTI causal system is Questions: (1)System function H(z), zero-pole plot and ROC (2)h[n]=? (3)Is the system stable? * , , UZT , zero-state response ZT , , Sketch the block diagram in 3 forms Example 10.31 System function: * 着重掌握直接2型 Problems: 10.2 10.6 10.7 10.9 10.10 10.16 10.18 10.23 10.24 * * * * By using partial-fraction expansion (2)If the system is causal, ROC of is (3) If the system is anticausal, ROC of is * (4) If the system is stable, ROC of is * The response to the input is Determine the system function and its ROC. * Solution:Since that So, is * Has two poles, 3 and -1/2 . ∵The ROC of is ROC of X(z) is So, * 10.5.6. Frequency Response and poles and zeros , , unit circle in the ROC. If order system (N 阶系统) has N poles. 10.26 10.27 Reading P763-766 * (1) All-pass DT system(全通系统) Only is constant 零点和极点互为共轭倒数关系(称为关于单位圆镜像对称)。 * (2) Minimum-phase DT system(最小相位系统) All poles and zeroes are inside the unit circle. That is, * bilateral ZT: bilateral ZT of unilateral ZT: * If x[n] is causal, If x[n] is not causal, * determine the . Solution: (1)Since
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