基于噪声抑制门的两级自适应线谱增强算法

针对低信噪比下，自适应线谱增强(ALE)算法在低信噪比时性能急剧下降的问题，该文提出2级ALE算法，该算法在普通的ALE算法的基础上，将输出信号和误差信号的傅里叶变换作为第2级ALE的输入，对线谱作进一步增强。并利用噪声抑制门对信号进行降噪预处理，然后结合提出的2级ALE算法，提出一种基于噪声抑制门的2级ALE算法，进一步提高信噪比，增强线谱。仿真和海试数据表明，算法性能较普通ALE算法有较大提升。

An Algorithm of Two-level Adaptive Line-spectrum Enhancement Based on Noise Suppression Gate

In view of the problem that the performance of the Adaptive Line-spectrum Enhancement (ALE) algorithm drops sharply under low signal-to-noise ratio, a two-level ALE algorithm is proposed. Based on the ordinary ALE algorithm, the Fourier transform of the output signal and the error signal is used as the input of the second-level ALE to enhance further the line-spectrum. The noise suppression gate is used to perform noise suppression preprocessing on the signal, and then combining with the proposed two-level ALE algorithm, an algorithm of two-level ALE based on noise suppression gate is proposed to improve further the signal-to-noise ratio and enhance the line-spectrum. Simulation and sea trial data show that the performance of the algorithm is greatly improved compared with the ordinary ALE algorithm.