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Aliasing and discrete low pass

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jonnybgood

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Here is my attempt to 2a) and some of 2b).

Question:

Screen Shot 2013-01-24 at 10.13.19.png

Screen Shot 2013-01-24 at 10.14.36.png

Given Responses and signals:

Screen Shot 2013-01-24 at 10.13.47.pngScreen Shot 2013-01-24 at 10.16.41.png

In b)i) it asks for the spectra at each node of the block diagram. Now, using the discrete low pass filter described in a),
would still give the same Yd (ejΩ) as in a) since the aliased parts are filtered out from -pi/2 to pi. If this is the case, why
does it mention new specifications for Hd (ejΩ) to obtain same Yd (ejΩ) as in a) ? I appreciate any guidance thanks.
 

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