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• Consider the 2-pt moving average
𝐻 𝑧 = 1
2 + 1
2 𝑧−1 𝑧 > 0 𝐻 𝑤 = 1
2 + 1
2 𝑒−𝑗𝑤 = 1
2 + 1
2 𝑐𝑜 𝑤 − 𝑗 1
2 𝑖𝑛 𝑤
𝐻 𝑤 = 1
2 + 1
2 𝑐𝑜 𝑤
𝜃 𝑤 = −𝑎𝑡𝑎𝑛 𝑖𝑛 𝑤
1 + 𝑐𝑜 𝑤