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The frequency response  of a system for impulse sequence response

 is

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Analysis:

h(n) = δ(n) + δ(n – 1)

H(Ω) = 1 + e-jΩ

H(Ω) = e-jΩ/2 (ejΩ/2 + e-jΩ/2)

∴ 

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