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# 1. Consider the discrete-time aperiodic signal x(n) = u(n) (a) suppose a = 2. what is the Fourier transform of x(n) ? (b) suppose a = 1/2. What is the Fourier transform of x(n) ? XDoes X(w) have any symmetry property ? Is the signal band-limited ? is it a high frequency signal? (c) Consider y(n) = Using modulation theorem property. find the fourier transform of y(n) .

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