非参数谱估计

x(𝑛 )=sin⁡ (0.1𝜋 𝑛 +𝜑 _1 )+0.5 sin⁡ (0.6𝜋 𝑛 +𝜑 _2 )+0.5 sin⁡ ((0.65𝜋 𝑛 +𝜑 _3 )+0.25 sin⁡ ((0.8𝜋 𝑛 +𝜑 _4 )+𝑣 (𝑛 )))

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Non-parametric spectral estimation

x (𝑛 ) = sin ⁡　(0.1π 𝑛 + φ_1)+0.5 sin ⁡　(0.6π 𝑛 + φ_2)+0.5 sin ⁡　((0.65π 𝑛 + φ_3)+0.25 sin ⁡　((0.8π 𝑛 + φ_4)+ 𝑣　(𝑛 ) ))