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=== Answer 1  ===
 
=== Answer 1  ===
Write it here.
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<math>\mathcal X (\omega) = \sum_{n=-\infty}^\infty (u[n+1]-u[n-2])e^{-j\omega n}=\sum_{n=-1}^2 e^{-j\omega n}=</math>
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<math>\mathcal X (\omega) = e^{j\omega}+1+e^{-j\omega}+e^{-j2\omega}</math>
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--[[User:Cmcmican|Cmcmican]] 19:57, 28 February 2011 (UTC)
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=== Answer 2  ===
 
=== Answer 2  ===
 
Write it here.
 
Write it here.

Revision as of 15:57, 28 February 2011


Practice Question on Computing the Fourier Transform of a Discrete-time Signal

Compute the Fourier transform of the signal

$ x[n] = u[n+1]-u[n-2].\ $


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Answer 1

$ \mathcal X (\omega) = \sum_{n=-\infty}^\infty (u[n+1]-u[n-2])e^{-j\omega n}=\sum_{n=-1}^2 e^{-j\omega n}= $

$ \mathcal X (\omega) = e^{j\omega}+1+e^{-j\omega}+e^{-j2\omega} $

--Cmcmican 19:57, 28 February 2011 (UTC)

Answer 2

Write it here.

Answer 3

Write it here.


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