x[n] is a finite-length sequence of length 1024, i.e.,
x[n] = 0 for n < 0, n>1023.
The autocorrelation of x[n] is defined as
and XN[k] is defined as the N-point DFT of x[n], with N ≥ 1024.
We are interested in computing cxx[m]. A proposed procedure begins by first computing the N-point inverse DFT of |XN[k]|2 to obtain an N-point sequence gN[n], i.e.,
(a) Determine the minimum value of N so that cxx[m] can be obtained from gN[n]. Also specify how you would obtain cxx[m] from gN[n].
(b) Determine the minimum value of N so that cxx[m] for |m| ≤ 10 can be obtained from gN[n]. Also specify how you would obtain these values from gN[n].
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