Newton Stewart
06/19/2023 · Junior High School
e) \( x(n)=n T, \quad \) para \( n=0,1,2, \ldots \quad \quad f(z)=\frac{T z}{(z-1)^{2}} \quad \) si \( |z|>1 \)
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Step-by-step Solution
To solve this problem, we need to find the inverse Z-transform of \( f(z) \) and then use it to find the sequence \( x(n) \).
Given:
\[ x(n) = nT \quad \text{for} \quad n = 0, 1, 2, \ldots \]
\[ f(z) = \frac{Tz}{(z-1)^2} \quad \text{for} \quad |z| > 1 \]
We want to find the inverse Z-transform of \( f(z) \), which is \( X(z) \). Since \( x(n) = nT \), we can use the Z-transform pair for a first-order difference equation:
\[ x(n) = nT \]
\[ X(z) = \frac{Tz}{(z-1)^2} \]
Now, we need to find the inverse Z-transform of \( X(z) \). The inverse Z-transform of \( \frac{z}{(z-1)^2} \) is \( n \), and since we have an additional \( T \) in the numerator, the inverse Z-transform of \( \frac{Tz}{(z-1)^2} \) is \( Tn \).
Therefore, the inverse Z-transform of \( f(z) \) is:
\[ x(n) = Tn \]
This is the sequence that corresponds to the given \( f(z) \) for \( |z| > 1 \).
Quick Answer
The inverse Z-transform of \( f(z) \) is \( x(n) = Tn \).
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