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I think the ROC for question 7a is incorrect. Should be |z| < 1/2. | I think the ROC for question 7a is incorrect. Should be |z| < 1/2. | ||
| − | * Nope, ROC is correct. Look at the second example I did on Friday and use the same trick. --[[User:Mboutin|Mboutin]] 18:12, 7 September 2009 (UTC) | + | * Nope, ROC is correct. Look at the second example I did on Friday and use the same trick. --[[User:Mboutin|Mboutin]] 18:12, 7 September 2009 (UTC) |
| + | **I tried to do this, but I get stuck with this, which doesn't compare well with the formula of the Z-Transform: <math>(1/4) * \sum_{n=0}^\infty (-z/2 + 3/4)^n </math> --[[User:Rodrigaa|Rodrigaa]] 19:47, 7 September 2009 (UTC) | ||
For problem 7d, the differentiation property might help. However, the ROC defined in the problem seems wierd. Negative magnitude? :( | For problem 7d, the differentiation property might help. However, the ROC defined in the problem seems wierd. Negative magnitude? :( | ||
Revision as of 14:47, 7 September 2009
I think the ROC for question 7a is incorrect. Should be |z| < 1/2.
- Nope, ROC is correct. Look at the second example I did on Friday and use the same trick. --Mboutin 18:12, 7 September 2009 (UTC)
- I tried to do this, but I get stuck with this, which doesn't compare well with the formula of the Z-Transform: $ (1/4) * \sum_{n=0}^\infty (-z/2 + 3/4)^n $ --Rodrigaa 19:47, 7 September 2009 (UTC)
For problem 7d, the differentiation property might help. However, the ROC defined in the problem seems wierd. Negative magnitude? :(
- Oops! Yeah the ROC was supposed to be $ |Z|<1 $. But, technically, the statement is correct, just a bit weird. --Mboutin 18:12, 7 September 2009 (UTC)
