Which of the following signals can be down sampled by a factor of 2 using the system
Question:
Which of the following signals can be down sampled by a factor of 2 using the system in Figure without any loss of information?
(a) x[n] = ?[n ? n0], for n0 some unknown integer?
(b) x[n] = cos(? n/4)
(c) x[n] = cos(? n/4) + cos(3? n/4)
(d) x[n] = sin(? n/3) / (? n/3)?
(e) x[n] = (?1)n sin(? n/3) / (? n/3)
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Related Book For 
Discrete Time Signal Processing
ISBN: 978-0137549207
2nd Edition
Authors: Alan V. Oppenheim, Rolan W. Schafer
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