The purpose of this problem is to show that the polynomials which are the system functions of the forward prediction-error filters of order m, m = 0, 1, . . . , p, can be interpreted as orthogonal on the unit circle. Toward this end, suppose that is the power spectral density of a zero-mean random process {x(n)} and let be the system functions of the corresponding prediction-error filters. Show that the polynomials satisfy the orthogonality property
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