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--[[User:Cmcmican|Cmcmican]] 22:09, 16 April 2011 (UTC) | --[[User:Cmcmican|Cmcmican]] 22:09, 16 April 2011 (UTC) | ||
:<span style="color:green">TA's comment: Correct!</span> | :<span style="color:green">TA's comment: Correct!</span> | ||
| + | :<span style="color:blue">Instructor's comment: Exactly where do you get that the norm of z must be less than one for convergence? It is important to clearly state it.</span> | ||
=== Answer 2 === | === Answer 2 === | ||
Write it here. | Write it here. | ||
Revision as of 04:07, 18 April 2011
Contents
Practice Question on Computing the z-transform
Compute the z-transform of the following signal.
$ x[n]=u[-n] $
Prof. Mimi gave me this problem in class on Friday, so I'm posting it and my answer here. --Cmcmican 22:09, 16 April 2011 (UTC)
Answer 1
$ X(z)=\sum_{n=-\infty}^\infty u[-n]z^{-n} $
let k=-n
$ =\sum_{k=0}^\infty z^{k} $
$ X(z)=\frac{1}{1-z} \mbox{, ROC: }\Big|z\Big|<1 $
--Cmcmican 22:09, 16 April 2011 (UTC)
- TA's comment: Correct!
- Instructor's comment: Exactly where do you get that the norm of z must be less than one for convergence? It is important to clearly state it.
Answer 2
Write it here.
Answer 3
Write it here.
