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战胜MATLAB必做练习50题，帮助你学会matlab(MATLAB exercises will be done over 50 questions to help you learn matlab)

这是数学专业的数学建模的课程设计，很有用啊，希望大家踊跃下载啊(This is the mathematical modeling mathematics curriculum design, very useful, ah, ah hope you actively download)

NPC inverter with pwm

传统的短时谱估计语音增强算法通常假设语音谱分量相互独立，没有考虑语音谱分量间的相关性。针对这 一问题，该文提出一种新的基于多元Laplace分布模型的短时谱估计算法。首先，假设语音的离散余弦变换(DCT) 系数服从多元Laplace分布，以此利用谱分量间的相关性；在此基础上，利用多元随机矢量的高斯尺度混合模型表 示，推导得到语音DCT系数矢量的最小均方误差(MMSE)估计的解析表达式；并进一步推导了基于该分布模型的 语音存在概率，对最小均方误差估计子进行修正。实验结果表明，该算法在抑制背景噪声和减少语音失真等方面优 于传统的语音增强方法。(The spectral components of speech are usually assumed to be independent in traditional short-time spectrum estimation, which is not the case in practice. Tosolve this problem, a new speech enhancement algorithm with multivariate Laplace speech model is proposed in this paper. Firstly, the speech Discrete Cosine Transform (DCT) coefficients are modeled by a multivariate Laplace distribution, so the correlations between speech spectral components can be exploited. And then a Minimum-Mean-Square-Error (MMSE) estimator based on the proposed model is derived using a Gaussian scale mixture representation of random vectors. Furthermore, the speech presence uncertainty with the new model is derived to modify the MMSE estimator. Experimental results show that the developed method has better noise suppression performance and lower speech distortion compared to the traditional speech enhancement method. )

时域有限差分方法在一维格子中计算麦克斯韦旋度方程(the finite-difference time-domain solution of Maxwell s curl equations over a one-dimensional space lattice comprised of uniform grid cells)

实现哈弗曼压缩编码的matlab程序。（m文件）(Huffman code)

不同的进化计算方法比较，并用matlab仿真实现(Constrained Evolutionary Optimization by Means of(mu+lambda) Differential Evolution and Improved Adaptive Trade-off Model Evolutionary Computation Journal, in press)

watermarking watermarking watermarkingwatermarking

附件是齿轮箱故障数据，txt格式文件，pdf格式的齿轮箱故障数据介绍，和word关于齿轮箱故障的知识详解，对研究旋转机械故障诊断的朋友有帮助(the attachment is the fault data of gear box in txt documents, and data instruction in pdf document. Also, the detailed intruction of gear box is in word documents.)

lsqr分解，方法简单，节省时间和内存，为反演算法提供了好的解方程(this programme used for LSQR)