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Gradient vector flow active contour

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. )

在MATLAB环境下用经典参数法求高斯信道的参数(In the MATLAB environment parameters method with the classical Gaussian channel parameters)

说明：  面阵波束形成，由两条垂直线阵组成的面阵波束接收天线(Planar array beam forming, by the vertical line array consisting of two side beam receiving antenna array)

本程序包包含两个程序和一个文档。两个程序为二进制与ASCII码之间的转换，文档为comtrade数据格式标准文档。(This package contains two procedures and documentation. Two programs for the conversion between binary and ASCII code, documentation comtrade data format standard document.)

这是基于PCA的人脸识别代码,识别率达到88.5 ,比较理想,希望对大家有所帮助.(This is a PCA-based face recognition code, the recognition rate of 88.5 , ideal, we want to help.)

产生噪声调频信号............(Generate noise FM signal)

matlab的图论工具箱，基本够用了，大家试一试。(matlab toolbox graph theory, basic enough, please try.)

说明：  用来测试压缩感知中构造的测量矩阵的RIP(Compressive sensing RIP)

FFT算法的实现，MATLAB仿真，验证，模拟(FFT SUANFA DE SHIXIAN ,FANGZHEN)