In Figure P2.72, two sequences x1[n] and x2[n] are shown. Both sequences are zero for all n outside the regions shown. The Fourier transforms of these sequences are X1(ejω) and X2(ejω), which, in general, can be expected to be complex and can be written in the form
where A1(ω), θ1(ω),A2(ω), and θ2(ω) are all real functions chosen so that both A1(ω) and A2(ω) are nonnegative at ω = 0, but otherwise can take on both positive and negative values. Determine appropriate choices for θ1(ω) and θ2(ω), and sketch these two phase functions in the range 0 < ω < 2π.
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