The frequency response of a desired filter hd[n] is shown in Figure P7.45. In this problem, we wish to design an (M + 1)-point causal linear-phase FIR filter h[n] that minimizes the integral-squared error
where the frequency response of the filter h[n] is
and M is an even integer.
(a) Determine hd[n].
(b) What symmetry should h[n] have in the range 0 ≤ n ≤ M? Briefly explain your reasoning.
(c) Determine h[n] in the range 0 ≤ n ≤ M.
(d) Determine an expression for the minimum integral-squared error as a function of hd[n] and M..
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