数值计算

令信号长度为N=256，用Levinson-Durbin迭代法解16阶AR模型的功率谱，程度可用(So that the signal of length N = 256, 16-step solution of the power spectrum of the AR model using Levinson-Durbin iterative method, the extent of the available)

李纯明教授的经改进后的无需初始化代码，内有程序说明(designed by LCM)

这是有关matlab 学习的一些技巧和程序代码的编写，其中有SIMULINK和matlab程序两部分(matlab study)

fit_maxwell_pdf - Non Linear Least Squares fit of the maxwellian distribution. given the samples of the histogram of the samples, finds the distribution parameter that fits the histogram samples. fits data to the probability of the form: p(r) = sqrt(2/pi)*(a^(-3/2))*(r^2)*exp(-(r^2)/(2*a)) with parameter: a format: result = fit_maxwell_pdf( x,y,W,hAx ) input: y - vector, samples of the histogram to be fitted x - vector, position of the samples of the histogram (i.e. y = f(x,a)) W - matrix or scalar, a square weighting matrix of the size NxN where N = length(y), or 0 to indicate no weighting is needed. hAx - handle of an axis, on which the fitted distribution is plotted if h is given empty, a figure is created. output: result - structure with the fields a - fitted parameter VAR - variance of the estimation type- weighted LS or not weighted LS iter- number of iteration for the solution

维纳滤波复原,规则化滤波复原程序,Lucy-Richardson复原程序举例,盲去卷积复原,逆滤波复原算法(Wiener filter restoration, rules-based filtering for restoration procedures, Lucy-Richardson restoration program for example, blind deconvolution restoration, inverse filtering restoration algorithm)

光栅模式传输 运用耦合模理论，有公式推导，直接明了，可以更改参数(Optical fiber grating transmission function simulation and may, according to the need of reality, change all kinds of parameters )

直接序列扩频通信系统误码率的仿真分析PN码同步方法的比较与仿真(Direct sequence spread spectrum communication system of the simulation analysis of PN Code Synchronization Comparison and Simulation)

非线性对象的线性化，cstr模型的建立，利用非线性求解方法实现其线性化(nonlinear translate to linear，model of cstr)

features to voice and un voice classification , pitch determination whith AMDF and other features like Spectral Centroid and Entropy of the energy

求图像的峰值信噪比PSNR，下载可以直接使用，希望能够帮助需要的同学(The peak signal to noise ratio of PSNR for the image.Download can be used directly, hope to help students in need.)