CAUSALITY (1hn] right-sided ROC is the exterior of a circle possibly di Including=00 H()=∑M2 If N1 <0, then the term h]-/100 at z=oo →ROC outside a circie, but does not include o Causal分N1≥0 No zm terms with m >0 →x=00∈ROC A DT LTI system with system function H(z)is causal e the roc of H(z)is the exterior of a circle including z=ooCAUSALITY (1) h[n] right-sided ⇒ ROC is the exterior of a circle possibly including z = ∞: A DT LTI system with system function H(z) is causal ⇔ the ROC of H(z) is the exterior of a circle including z = ∞ ⇓