Consider the two systems shown in figure(a) Sketch the spectra of the various signals if xa(t) has the Fourier transform shown in figure(b) and Fs = 2B. How are y1(t) and y2(t) related to xa(t)?(b) Determine y1(t) and y2(t) if xa(t) = cos2?F0t, F0 = 20 Hz, and Fs = 50 Hz or Fs = 30 Hz.

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y(n) = x*(n) Xin) Ideal Idcal A/D D/A F, s,1) = r) s(n) Idea! Ideal (- A/D D/A F, (a) X(F) -B (b)