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文章展示了基于高斯混合模型的语音频谱预测方法。频谱预测可能在传包过程中预防丢包这方面起到大作用。期望最大化算法用两倍或三倍的连续语音因素来测试模型。模型被用来设计第一，儿等指令预测量。预测表用频谱分配状态来估计并和一个简单的参考模型对比。最好的预测表得到一个平均频率扭曲值是0.46dB小于参考模型(This paper presents methods for speech spectrum prediction based on Gaussian mixture models. Spectrum prediction may be useful in a packet transmission system where the sensitivity to packet losses is a major problem. Models of speech are trained by the Expectation Maximization algorithm using pairs, triples etc. of consecutive cepstral vectors. The models are used to design first, second etc. order predictors. The prediction schemes are evaluated using the spectral distortion criterion and compared to a simple reference method. The best prediction scheme obtains an average spectral distortion that is 0.46 dB less than for the reference method. )

when SNR is high , 1st sample estimator provides good estimate of A. it has no noise effect . so we don’t need averaging effect to reduce noise when SNR is high. However variance is still low in sample mean estimator which shows that in reality ,sample mean is good estimator than 1st sample estimator. So, for high SNR, we do not need to reduce the effect of noise by averaging. or we can say that for high SNR let say >1000 , 1st sample estimator got reduced noise. But as for as variance is concerned , the sample mean has low variance for high SNR as well.

convert video to frame and covert images to video

模拟通过一个高度非线性光子晶体光纤(PCF)传播的kW峰值功率孤子脉冲。(These scripts simulate femto-second soliton pulses, with kWs of peak power, propagating through a highly non-linear Photonic Crystal Fiber (PCF).)

精通MATLAB 是北航的张志用写的电子书 介绍了MATLAB6.5的使用 (Proficient in MATLAB was written by Zhang Beihang' s book describes the use of MATLAB6.5)

这是我编的一个乘子法的MATALB程序，大家看一下，还有什么需要改进的(This is Part I of a multiplier method MATALB program, we look at what needs to be improved)

三个空间错开漩涡光束左旋螺旋形焦点在YZ平面的强度分布计算程序(YZ distribution of left handed spiral focal spot)

增量谐波平衡方法(IHB)是一种有效的定量分析方法，既适用于分析弱非线性振动系统，也适用于分析强非线性振动系统，并且可以提高周期解的精度(Incremental harmonic balance method (IHB) is an effective method for quantitative analysis, both for the analysis of weakly nonlinear vibration system, also suitable for the analysis strongly nonlinear vibration system, and can improve the accuracy of Periodic Solution)

本源码是用于ad hoc中一种改进的预约多址协议的仿真，具有吞吐量高，支持QoS的特点。绝对可以运行。(source for the ad hoc An Improved PRMA agreement simulation, with high throughput, QoS features. Absolutely can run.)

convolution, capture, envolvente EMG, pulse PWM and trasformation code in matlab compared matlab own