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Problems 209<br />

where l is an integer. Notice that x(n) contains exactly l periods (or cycles) of the cosine<br />

waveform in N samples. This is a windowed cosine sequence containing no leakage.<br />

1. Show that the DFT X(k) isareal sequence given by<br />

X(k) = AN 2 δ (k − l)+ AN 2<br />

δ(k − N + l); 0 ≤ k ≤ (N − 1), 0

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