说明：  提供自适应线谱增强函数。结合LMS算法和自适应滤波来实现线谱增强。实现受白噪声 (mu,sigma)污染的单频信号(frequency f)的增强。
(function to perform adaptive line enhancement using LMS algorithm and an adaptive FIR filter。 ALE concept enhances a single tone signal (frequency f) affected by white noise (mu,sigma))