中文说明：music高阶谱分析算法，用于建立主成分分析模型，构成不同频率的调制信号，这是第二能量熵的matlab代码，该函数用来计算任意函数的一阶偏导数(数值方法),多抽样率信号处理。
English Description：
Music higher order spectral analysis algorithm for a principal component analysis (PCA) model, constitutes the different frequency modulation signal, which is the second energy entropy matlab code, this function is used to calculate any function of the first order partial derivative (numerical method), multi sample rate signal processing.