jisuanqi

说明：  这是一本有关matlab的书，对matlab学习者有用(This is a book about matlab and is useful for matlab learners )

fem in matlab a good sourse for structural engineers

dipum_images_ch05 matlab 编程实例(dipum_images_ch05 matlab Programming Example)

这是matlab中实现PID经典控制算法程序(This is the classic PID control algorithm program in matlab)

说明：  海平面数模程序——针对国际赛的一个题目，很好很实在(Sea-level digital-analog process- a topic for international competitions)

弹性波在饱和多孔介质中传播的BISQ模型(BISQ model for elastic wave propagation in porous media)

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. )

求序列向量xn的傅里叶变换和离散傅里叶变换并画出它们的幅频特性和相频特性曲线，验证离散傅里叶变换是傅里叶变换的等间隔采样，验证IDFT和DFT的唯一性(Find the Fourier transform of the sequence xn vector and the discrete Fourier transform and draw their amplitude-frequency characteristic and phase-frequency characteristic curve, verify the discrete Fourier transform is the Fourier transform of equally spaced sampling, verification of IDFT and DFT Uniqueness)

fastkurtogram是法国人编辑的程序，可以用他快速进行故障诊断(fastkurtogram Frenchman editing program, with his rapid fault diagnosis)

老外写的关于使用matlab解决应用数学的一些问题，英文版(Solving. Applied. Mathematical. Problems. With. MATLAB,. Xue,. Chen,. CRC,. 2009 foreigners wrote about using MATLAB solve some of the Problems of Applied mathematics, English version)