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The following transfer function characterizes an FIR filter (N = 9). Determine the magnitude response and show that the phase and group delays are constant.H(z)=N1n=0h(n)zn
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Solution:

The transfer function of the filter is given by,

H(z)=N1n0h(n)zn=h(0)+h(1)z1+h(2)z2+h(3)z3+h(4)z4+h(5)z5+h(6)z6+h(7)z7+h(8)z8α=N12=912=4.

$ \begin{aligned}\\ H(z)= & z^{-4}\left[h(0) z^4+h(1) z^3+h(2) z^2+h(3) z^1+h(4) z^0+h(5) z^{-1}+h(6) z^{-2}\right. \\\\ & …

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