Question: Let x[n] be a real, causal, finite-length sequence with length N = 4 that is also periodically causal. The real part of the 4-point discrete

Let x[n] be a real, causal, finite-length sequence with length N = 4 that is also periodically causal. The real part of the 4-point discrete Fourier transform X_R[k] for this sequence is shown in Figure. Determine the imaginary part of the DFT j X_I[k].

Xx|k) 0 1 2 3 k

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