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学习并找到降噪方法，对语音信号背景噪声做处理，使得声音更清晰。(The background noise is the most common factor degrading the quality and intelligibility of speech in recordings. Spectral subtraction can lower the noise level without affecting the speech signal quality. In this paper, we have studied and implemented to reduce the background noise of the voice signal, and to make improvements to reduce the background noise of the experiment. Not only with the spectral subtraction of the noisy signal of the transformation, we improve the traditional spectral subtraction based on the introduction of the parameters, by adjusting the parameters(α、β、γ) to achieve better enhancement.)

计算时间序列样本熵，一种很有效的算法，依据算法步骤而编译(Calculate time series sample entropy)

modeling and control of fully wind turbine system

这个文件中是计算方法中牛顿迭代法的具体说明及计算计算举例。(This file is in the Newton iteration method for specific instructions and calculation Examples of calculation.)

This is a simple function which caculates the spherical harmonic.The archive includes four M files ,and the file Comx_Sph.m is the main function.Given the degree l ,the index m and the variable x ,you can get the value of spherical harmonic.For more details ,you may read the programs.

文章重点讲述了MATLAB与Excel间的数据交换应用和原理。(This paper focuses on the application and principle of data exchange between MATLAB and Excel.)

说明：  基于DWT域的数字水印技术，子带编码隐写程序(DWT domain based on digital watermarking technology, subband coding steganography program)

Linear congruential generator

目标因子分析，用于找寻主因子数的个数，用途广泛(Target factor analysis, to find the main number for the number of factors, versatile)

Convert from Lab to LCH.