(New page: At first I was confused by this question. I think it is fairly straight forward to see that you need to use partial fraction expansion and then take the inverse z-transform to obtain x[n]...) |
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At first I was confused by this question. I think it is fairly straight forward to see that you need to use partial fraction expansion and then take the inverse z-transform to obtain x[n]. However, I did not understand how it was possible to have three separate solutions for x[n]. Looking at the transform pairs in ECE 438 Essential Definitions for the z-tranform, you notice that 2. and 3. have the same z-transform but different x[n]'s and different ROC's. Looking at the ROC's, you can figure out three different possible solutions and derive the corresponding x[n]'s from there. --[[User:Babaumga|Babaumga]] 16:27, 24 February 2009 (UTC) | At first I was confused by this question. I think it is fairly straight forward to see that you need to use partial fraction expansion and then take the inverse z-transform to obtain x[n]. However, I did not understand how it was possible to have three separate solutions for x[n]. Looking at the transform pairs in ECE 438 Essential Definitions for the z-tranform, you notice that 2. and 3. have the same z-transform but different x[n]'s and different ROC's. Looking at the ROC's, you can figure out three different possible solutions and derive the corresponding x[n]'s from there. --[[User:Babaumga|Babaumga]] 16:27, 24 February 2009 (UTC) | ||
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| + | I guess that the ROCs are in 3 cases. | ||
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| + | 1) <math> |z| < \frac{1}{2}, |z| < 1 </math> | ||
| + | <br> | ||
| + | 2) <math> |z| > \frac{1}{2}, |z| < 1 </math> | ||
| + | <br> | ||
| + | 3) <math> |z| > \frac{1}{2}, |z| > 1 </math> | ||
| + | |||
| + | If not, please reply.--[[User:Kim415|Kim415]] 16:33, 24 February 2009 (UTC) | ||
Revision as of 12:33, 24 February 2009
At first I was confused by this question. I think it is fairly straight forward to see that you need to use partial fraction expansion and then take the inverse z-transform to obtain x[n]. However, I did not understand how it was possible to have three separate solutions for x[n]. Looking at the transform pairs in ECE 438 Essential Definitions for the z-tranform, you notice that 2. and 3. have the same z-transform but different x[n]'s and different ROC's. Looking at the ROC's, you can figure out three different possible solutions and derive the corresponding x[n]'s from there. --Babaumga 16:27, 24 February 2009 (UTC)
I guess that the ROCs are in 3 cases.
1) $ |z| < \frac{1}{2}, |z| < 1 $
2) $ |z| > \frac{1}{2}, |z| < 1 $
3) $ |z| > \frac{1}{2}, |z| > 1 $
If not, please reply.--Kim415 16:33, 24 February 2009 (UTC)
